Well. That turned from an off-hand suggestion to an actual plan really fast, didn't it? The details are still fuzzy, but heading back to California to tie up some loose ends might be the best course of action right now. After that, who knows. He wouldn't mind reclaiming his soul the demon-bashing way rather than with a curse, but perhaps there are other ways to go about it.
"Guess that's settled, then. Though I got a feeling I'd still be better off leaving you two in LA, before Jack shags the entire high school."
Then again, that would be perfectly in line with all the other shit that happens on the hell mouth.