Why do you think everyone would need to move? Some would, yes. I've had friends do that. But mostly it would be come local members. So, DCI would return to the local model, just in the winter. It isn't that crazy of an idea. Groups would have to get smaller because, you know, hearing damage and all. But that could lead to units with multiple groups across multiple classifications. For example, BD regional A, BD A, BD open, BD world. And maybe we get an even more "avant garde" type classification were groups have their most talented members swinging from the rafters while farting into kazoos to play Mahler's 5th.
I'm all for anything that puts instruments in kid's hands and lets them perform. I do not care about what the combination of instruments/equipment. If DCI dies and is replaced by "band" I'll continue to support and buy tickets. Because that is what the point is to me. Students performing and living their best musical lives.