I agree that it's probably a timed exclusive and will eventually make it's way to PC, but if it doesn't sell on consoles is it really likely they'd port it too PC? Did Psychonauts sell better on PC? I mean if it sells poorly on one platform it doesn't make much sense to port it to another if you think it will do even worse.
I'm pretty sure they're porting it as we speak, or when the console versions go gold. It was planned for PC for a long time, then some time ago it went console only. If it sells badly, they'll want to maximize the profits and they'll release it on anything they can.
On the PC it'll have way longer legs, especially if it's good. Consoles games have always been a big bang and fizzle(except Nintendo's first party games).
EDIT: Getting your 360 fixed if you're living outside of USA must be fun...