Amare Stoudemire for Tim Duncan?

Should the Spurs trade Tim Duncan for Amare Stoudemire? It sounds crazy, but the Spurs have a lot of young, explosive talent and maybe Duncan has slowed down too much to help them get back to the Finals. Is it worth it to switch things up? The Suns, on the other hand, have already dealt Shawn Marion for Shaq so why not bring in another veteran big man and play a half court game? It's an interesting proposition.