I always get the impression that Ian and Paul might not sign for more also, Paul especially has been quite vocal on not always being happy with the writing, but I guess that things can always change if they get really good offers (which I would except from the CW to keep the show going) to stay. It would be a shame to lose a lot of regulars, so I hope that they manage to wrap things up while most of the cast is still intact at least.

I guess that the actors leaving the show would be one way to end the writer cheats though, and ensure that the regular characters actually stay dead :P