Get Garret Wang. He's starving for jobs.
I'd be more inclined to go see a film because Garrett Wang was in it than because Shatner was in it. You can't miss someone if they're everywhere, all the time...
That aside, I don't really have a problem with Shatner being in the next film. He certainly can't make it any more campy than it's already bound to be, and I'm interested in seeing his 'Kirk' after so long.