Well, I think he could be used as part of a bigger package, or a sign and trade, but if we are talking a smaller trade, here are the guys I would look really hard at:
Marvin Williams (if they want to resign Johnson and bring Childress over, they might look to dump him)
Nazr Mohammed - He had a great year last year, and would allow the C's to save the cap room next year.
Charlie Villanueva
Jeff Foster - Indy is close to the luxury tax, and would likely be happy to shed the salary
James Posey and Darren Collison - how desperate are the Hornets?
Leandro Barbosa - if they lose Staudemire, their cheap owner could look to sell off everyone. Given the emergence of Dragic, Barbosa is not as necessary, so they might welcome getting him off the books.