A measure to shrink the tournament and move back to super regionals or on-campus sites will not be approved. The coaches want those extra at-large berths too much to give that up. I might be misremembering but I believe one of the stipulations of moving to a 16 team tournament was automatic qualification for smaller conferences like the AHA and CHA. If the tournament shrinks not only are (3) at-large spots gone but the AHA would lose the qualifier. Without a chance to ever compete in the national tournament how many of those schools will decide a better investment would be a lax, volleyball, crew or some other sport that costs a fraction of ice hockey?
I think another stipulation was going to 4 neutral site regionals. The NCAA always wants to promote growth (of revenue at least) and it sees that as neutral regionals. If the NCAA could generate more money by moving to super regionals or going back to campus the NCAA would promote this. That the NCAA hasn't is a good indication it sees no problem with the status quo.