Alright. I got a rough outline of the argument for an infinte multiverse and higher tiering for the god tiers. Any input or additions of course is apprieciated.
So, I believe that the Xenoverse characters, specifically the god tiers should likely be upgraded. Here are a few statements and feats to support this.
1. The time egg from toki toki is capable of more than just creating 1 timeline. In fact it is stated, if the time egg is broken then everybody will go up in smoke, despite jumping timelines and having the abiltiy to even leave timespace of the multiverse. So while Mira's overload is capable of destroying multiple timelines, so is the time egg if broken to. Thus it likely has more than a single timeline level of power when used to it's full capacity.
http://i.imgur.com/9NILTFS.jpg
http://i.imgur.com/eN6gTyI.jpg
http://i.imgur.com/LAuiLsO.jpg
http://i.imgur.com/MmqRjUb.jpg
[COLOR=rgba(0,0,0,0.87)]2. Towa and Mira planned to fuse the demon realm with Universe after obtaining Toki-Toki's egg.[/COLOR]
http://i.imgur.com/dMvshzm.jpg
http://i.imgur.com/6psuCeW.jpg
3. Beerus and Whis actually tank the destruction of the entire multiverse casually. When Demigra destroys the time vault succesfully and all timelines with it Beerus had went back to his castle in his timeline to sleep, and Whis with him. It is stated by Whis later that he ahd watched it all and the events were no big deal and not worth even waking Beerus up for. So they literally tanked the erasure of the multiverse unharmed, it didn't even wake Beerus up.
https://imgur.com/a/5e2jr
https://imgur.com/a/MnLgd
https://imgur.com/a/ODy5t
And here we see the scroll for the timelines are blank after the future warrior is saved by Toki-Toki.
https://imgur.com/a/qvynt
4. Beerus is also unafraid of the destruction of the multiverse from Demigra knowing full well what it entails, and even willing to cause it himself to.
http://i.imgur.com/y3x6giA.jpg
http://i.imgur.com/URIwlfZ.jpg
http://i.imgur.com/3Dck7Hz.jpg
5. Even Old Kai in the time nest is afraid of Beerus destroying everything from within the U7 timeline, no time nest. Beerus is even stated by him to be able to end the Universe.
http://i.imgur.com/JER2vGN.jpg
http://i.imgur.com/YZ3W11a.jpg
http://i.imgur.com/9Psbp2O.jpg
http://i.imgur.com/Dx5j604.jpg
http://i.imgur.com/XwZvtWY.jpg
6. The kai of Time states Beerus could destroy everything, all history, this is when he was not in the time vault or aquainted with the pattroler.
http://i.imgur.com/koF2lfV.png
http://i.imgur.com/NMLVUGC.png
http://i.imgur.com/DJdaumG.png
7. It is confirmed by Kai of time that Demigra was indeed warping time, the Universe, all of History, everything, and the future warrior saved all of it. This is beyond just one Universe. So clearly above Universe+.
http://imgur.com/mw6WwOP
http://imgur.com/HQndtfE
http://i.imgur.com/7LxXCWp.png
http://i.imgur.com/ISqwcQ6.png
http://i.imgur.com/lGbUFVC.png
8. Demigra is stated to control all of space and all of time.
http://imgur.com/0cZ2Dpe
9. Demigra can create his own history in his image.
http://imgur.com/QQkjB5u
10. Demigra is stated in v-jump to be the final villain "beyond time and space"
https://imgur.com/a/xSdJG
11. Demigra's attack description for one of his moves in Heroes states that he "spatialy trancends" other dark makai warriors.
https://imgur.com/a/C9XQ3
12. Demigra can create and throw time chasm crystals as one of his attacks in heroes. These crystals hold Ages, or in Xenvoere timelines.
https://imgur.com/a/Oe25a
https://imgur.com/a/Dqahk
https://imgur.com/a/qAJ5i
https://imgur.com/a/4kxfP
https://imgur.com/a/mI5A
Proof ages are timelines, such as Turnks future one.
https://imgur.com/a/cuwAW
https://imgur.com/a/YNlyP
https://imgur.com/a/2Prfb
https://imgur.com/a/NsNvv
https://imgur.com/a/YtDnm
https://imgur.com/a/rKeha
Showing at the start that the crystals hold ages again, and that one is actually destroyed when Buu gets powered up and the outcome of history changes.
https://www.youtube.com/watch?v=ysn74eGFYC8
13. Zamasu crosses the entire multiverse and trancends the timelines to reach the time nest even.
https://i.imgur.com/WA6hES3
https://i.imgur.com/fPtJLez
https://i.imgur.com/8v8tpEC
https://i.imgur.com/asl6dhR
https://imgur.com/a/qwoDs
https://imgur.com/a/5YJqZ
https://imgur.com/a/0at9Z
Now that we have covered many of the most impressive feats and statemtns about teh power of the gods in DBX, we should cover the size of the multiverse and each timeline actually.
1. Each timeline contains 12 Universes just like in DBS, as well as an afterlife and other realms seperate from each as seen with the janemba battles.
https://www.youtube.com/watch?v=nSKd8sauDZw
https://www.youtube.com/watch?v=ATLjKRDZur8
So erasing or controling 1 timeline is actually multi-Universal.
2. There are ALOT more than 4 timelines in DBX to unlike Super.
1. As far as how many timelines there are, we see directly in Xenoverse that there are many, such as for the movies and GT, each scroll is one theoretically, and it is even explained by trunks that all the time fragments are alternate timelines, they result in scrolls, but even when fixed and added to the main scroll the timelines remain regardless, if to many scrolls accumulate then it can destroy the Universe by destroying the time vault.
http://i.imgur.com/LqGoiOe.jpg
http://i.imgur.com/gnkrNem.jpg
http://i.imgur.com/fvH07QP.jpg
http://i.imgur.com/TUBrGIp.jpg
http://i.imgur.com/mvoIeur.jpg
http://i.imgur.com/6ouK0iO.jpg
http://i.imgur.com/Ncpktg7.jpg
http://i.imgur.com/Z25Tp21.jpg
2. We even see it stated outright that there are "infinite" timelines/paths for history to take, and that there is "no end to it" and it is "hard to keep track of the proper one", proving the paths already exist, and are infinite histories or timelines they can't keep track of.
https://imgur.com/a/3UUOU
3. In Super Pilaf states there are "tons" of timelines. Note Pilaf was able to fix a problem with the time machine that Bulma was having trouble with, and was making giant mechs even in Dragon Ball, so he is a genius and understands time travel.
http://i.imgur.com/Qh3jbV7.jpg
4. It is stated by Trunks that "many diffrent futures are created over the smallest of things" showing any changes/decisions result in many timelines being made during time travel in DB.
https://imgur.com/a/0FNKN
5. And if we connect Shin Budokai which is a sequel to fusion reborn and 2 years after buu, so technically can link to Xenoverse since it also has FR timeline and many others, then according to Cell there are "endless" timelines.
http://i.imgur.com/J9flgps.jpg