Or are we proposing that people be compelled to GM against their will? Actually, that might help solve the problem of not enough GMs for gamedays... :P
Mandatory fun is the best kind of fun. Mandatory fun for everyone!
Mystic, how big are the game days where you DM usually? In a really big game day the dm booting you means you play a different scenario. In a reasonably size group it probably means you have to play in another tier. In a smaller group it could mean you have to go home. (or well, you don't have to go home but you can't stay here)
Bigger than I thought, I guess. It's been a while since I was involved, and I wasn't the coordinator, but there were usually three or four tables going. I usually got the new players and the low level tables, but we always seemed to be able to find room for everyone who showed up. If work would relent a little, I'd like to get something going again a little closer to where I live. Honestly, I'm worried about having enough players, not having to turn them away.
I understand, at least on some level, that having a "picky" or "diva" GM who doesn't enjoy running for some combination of players could make coordinating harder, but not as much as not having that GM willing to volunteer at all.