The thing with a trade is making salaries match, though with the 25% + $100K cushion afforded by the new CBA, that's not as big an obstacle as it was before. Still, Rip is slated to make less than $9 million next year, so that would mean Hughes would have to be willing to take (and the Pistons willing to pay him) something like 2x the MLE. They could up the ante by dealing both Hamilton and Prince for Hughes, but I can't see Dumars doing that.
Frankly, I'd rather have both Hamilton and Prince together than Hughes alone. I think the Pistons need depth, and not an overhaul, at the wing spots. But if Hughes is depth, you'd better hope, as AHF notes that he's willing to come off the bench and to do so at a price that is seriously under his market value.
If I'm Danny Ferry -- I'm making Hughes a sizeable offer, if only to keep him away from Detroit, or to force the Pistons to overbid him. The Cavs would do well with a guy like Hughes (particularly since Redd appears to be more heavily involved in what the Bucks are doing these days) to pair with Lebron.