I know there is a thread floating around that discusses this, but who likes thread revivals anyway?
My personal opinion is there is no way to divide all of FRC into regions unless there is explosive growth in certain areas, which I don't see happening anytime soon. Eventually enough areas will be "sectioned off" into the islands that the current district models have that travel for many teams/volunteers, who are left out, will be insane. At this point everyone will go to a points based system and the points will be used for championship spots. In this scenario there would be no "state" championships or borders because how could you divide those in less team/volunteer dense areas into regions without crazy travel? The issue with this is awards like chairman's and EI.
Any model for the current island type district areas would have to have fluid borders so you don't get things like the Western U.P. in Michigan competing in the L.P. when Wisconsin/Minnesota is quite a bit closer.
Eventually I can see something like little league baseball does, but that is way down the road.