To expand on Briewear's post, I might start these discussions in a Discord channel as opposed to making a thread.
Ubers is actually already "sort of" split into two tiers, those being Ubers and Anything Goes. Anything Goes hasn't always existed, but I cannot remember for the life of me when it was introduced (it was, IIRC, whenever Mega Rayquaza was born). It is a bit unlikely that there will be further changes to the Ubers format, mostly because it's specifically meant to be the tier with the least adjustments and least influence from an outside perspective, only really removing threats that warp the format to an outrageous degree. If you think a mon or mons in current Ubers is indeed doing that, the typical suggestion would be moving it to AG. And on the other side (the "low power" side of Ubers), you'd be looking to suggest a suspect test in OU for the Pokemon in question.
Happy to talk about it further, just don't want you to put a ton of effort into a post that may be brushed aside!
-"Man of the People" teal6