Punkorange, hong's got it right; you can't make someone DM; but you can be up-front with your players, and say, "guys (or ladies and gents), I'm feeling a bit burned out with DM'ing, since I've been doing it for a while now. If no one else feels ready to run something, I'm going to suggest some other games to play - Uno, Risk, Magic the Gathering, etc.etc.etc."
And then DO it. Don't game, just veg out a while, or play Uno if they're game (or whatever group game you're into). Don't back out and start something else you just half-heartedly want to run, because (A) they'll subconsciously assume you'll DM no matter what, and (B) the game will suck because you have little to no drive for it. Playing an RPG after that point is up to the group, not just you.
You mentioned another player wanting to run Babylon 5. Good for you! Jump in , even if you'd rather be playing D&D, because you never can tell what will unexpectedly recharge your juices. Unless you hate B5, in which case just find another activity. You may not be able to win 'em all, but lagging onward in a situation you hate being in is FAR worse.
Good luck.
