There was a battle a few years back about totally deregulating how conferences determined championship game participants sponsored by the ACC and Big 12, but it failed and the compromise was to allow conferences with 10 teams that played a round robin schedule to hold a championship. The change in the ACC/Big 12 proposal was driven by the Big 10.
I don't the NCAA will give the AAC an unlimited waiver for holding a conference championship game with 11 teams and no clear plans to add a 12th. That is a rule change. If the AAC was going back to 12 teams in 2021 and requested a waiver for 2020 only, maybe they would get a one year waiver.
If the NCAA said they would give a waiver for one year, that means the AAC needs to add a team for 2021 and it is getting late. And, outside of BYU as a football only, who would you add?
I think the reason we have not heard boo on the 2020 schedule is that in some way it involves the AAC. Either UConn is playing in the AAC next year or playing a number of AAC teams OOC next year.
Honestly, for the AAC, staying at 11 for basketball is the right move as they can then move to a 20 game schedule like most conferences which would be a round robin. Keeping UConn as the 12th team for football makes sense as well. Sure, UConn football is down, but it is a brand and we can attract attractive OOC home games that increase the value of the TV contract. And, maybe ESPN will finally come through for UConn and pressure the AAC to keep UConn football. (We can hope!)