3 seasons ago he would never be traded. The only reason he might be traded is because of the things you listed. This would be a high risk/high reward deal. If he can't stay healthy then you wasted a few picks and some money and he walks at the end of the year.
But if he comes in healthy then dear god, what defense is going to be able to deal with Michael Thomas and A.J. Green on the same offense? Honestly to me, the reward is probably a Super Bowl. When Drew comes back and with this defense, you insert another weapon like A.J. Green and that's a wrap. People are sleeping on how good Green is. He's 31 years old, not 41. He's still in his prime.