I can see the advent of preliminary qualifying competitions, similar to what many states have for FLL. In Michigan, you go to one of the qualifying tournaments, and about 1/4 advance to State. For FRC, this could be modified to have two weekends of preliminary tournaments to whittle the field down to about 1000 nationally, which are then eligible for the 30 or so larger regional tournaments. You would have to advance out of at least one preliminary tournament sometime before you are eligible for the Championship “Tier” system.
Alternatively, we may get to the point where teams are limited in the number of regionals they can attend.