I would stay put, but if he sweetens the WR a bit more than Collie I'd prolly jump. Peyton looked like he was REALLY throwing to Garcon and Wayne last week, and with Clark ahead of him in the pecking order in Indy, I don't like his weekly prospects much at all...
I'd make that trade. Maroney for Collie is basically a push. So you're getting Mendenhall for Boldin and I'd much rather have a starting runningback than a WR on a team with a lot of options.