It would be AMAZING to see us trade Ronnie Brown straight-up for Calvin Johnson, but I would say there is virtually no chance of that happening.
One can dream...can you imagine a team with Brandon Marshall and Calvin Johnson? Best WR tandem in league history? Virtually any RB could post 1000+ yard seasons with those two on the team...those two would make an above-average QB look like a Pro Bowl-caliber QB
If we did that trade, I would put us in the Super Bowl for next year. No joke. We would average 45 plus points a game. We would be sold out every game. It would be rockin.