Wow, that is a blockbuster. Here's the question. Do you think Johnson will upgrade your WRs enough to overcome the hit at QB, and potentially at RB. I don't think you would be stupid to take the deal. The problem for you is TO has been such a bust, and I'm not sure it will get better. Houch hasn't been much better.
What's your standing in the league? Do you need to make a trade like this? If you are out of the playoffs right now, I say do it. If you are in good standing, don't take the chance.
12 Team League. We start 2 QBs and get .5 PPR, otherwise standard scoring
QBs: Stafford, Fitzpatrick, Collins
RBs: Charles, Mendenhall, Best, Starks, Carter, Karim
WRs: D. Jackson, Marshall, S. Smith, Green,
TE: Hernandez, Cook