Now I've had a few moments to digest the idea, I really don't mind. Now, I don't really want a Ghost!Spike any more than anyone else, but if the return to corporeality is going to be long, then doesn't it at least give him some sort of character arc? Isn't it better than a S/A/B triangle (not that we might not get that)?
I feel at least this gives him a story and keeps him away from Buffy (to logically keep him on AtS). Hopefully, this'll mean snarky pain-in-the-arse!Spike for awhile other than one who is in deep pain again.
I'm going to remain optimistic (and probably deluded).