On any other team he'd be sent back? He's leading the league in hitting!!! While his road average is lower than his home average, he's still hitting over .300 on the road.
I happen to own him and also happen to agree that its time to sell, but not because he's going to be sent back to the minors, but that he's not going to keep this pace (additionally, I have M. Young).
If you can get a Sheff for him, I do it... but no need to just dump him.