The real historical evidence is that WR is the most expendible position on the field typically, and teams trading WR away tend to fare well in such trades. Joey Galloway to the Cowboys for two first rounders comes to mind (which was absurd even at the time). Two first round picks next year, even at the low end of the round, would be quite the boost going into next season. BB and Pioli haven't blown one yet, and their first round rookies have always contributed in their first seasons, so I wouldn't mind it, especially if we could package a lower round pick and grab Engram.