Between the paycut and relegation to the bench, I can't imagine he'd come here now.
Plus, would it really be that rewarding for an MVP like him to come here and play limited minutes to get that elusive championship? It's one thing for a guy like P.J. Brown to do that, but P.J. isn't going to the Hall of Fame. Nash on the other hand really doesn't enhance his legacy by latching onto the C's for a year, playing 15-20 minutes a night on the way to a title.