The people who think it would be a good idea to expand the tournament are out of their minds. There have been, what, four or five competitive games so far? Never mind upsets, the sheer number of blowouts should be a wake-up call that 64 teams is at least optimal and arguably too many in the NIL era.
One change that would amuse me - and probably only me - is for the committee to select 64 teams and then randomly draw opponents to start the tournament. So if for example Duke winds up playing Arizona in the first round, so be it. Also, first round game sites would be at the campus of the team that wins a coin flip. Same for the second round, with two days of travel time built in. The same procedures would apply for the Round of 32/16/8/4. The only game with a predetermined site would be the Championship.
I would also toy with the idea of allowing surviving teams to poach players from eliminated teams with the caveat that the acquiring team would need to keep that player on their roster the entirety of the following season, unless the player has exhausted eligibility. And if the player decides to transfer, you lose the scholarship/roster spot for that season.
MAXIMUM Chaos.