I think I'm in it to win it. I've been craving a new SW experience for a while and since I sunk a few years into SWG this is all very nostalgic to me. I'll make the jump on day one.
It'll be tough to hold off on a new Azeroth if they end up coming out at the same time. It comes down to the fact that I'd rather be immersed in a world that I grew up with rather than a world that I didn't (I was a Command and Conquer fanboy, not Warcraft).
If SWTOR ends up a flop, WoW always saves my toons when I'm not playing.
Only thing I'm hoping for is that the rest of my guildies who have been looking at SWTOR make the jump as well.