I think this is a pretty fair trade which makes sense for both sides. Ideally, I'd do this without swapping the picks, but I guess Pistons would then balk.
Pistons acquire an allstar PG in Rondo who can make the Smith signing look like a good one, and they move both Monroe and Smith back to their more natural positions.
Meanwhile, C's acquire a legitimate center who is very young, and who would also be a great pairing with Sully. Call me optimistic, but that could be the best front court in the league a year or 2 from now. Dunno how much Jennings makes, but I read on this thread that he makes 8m? That's less than Green. That's not so bad, considering he's a better player than Green. We still wont be a contender next year, but the rebuild looks very bright.