You've also got to account for the fact that trading Gurley gets rid of the guy who's the main beneficiary of everyone getting open anyways. Suddenly teams don't stack the box, start double teaming our guys and sending heavier blitzes which more than likely lessens how open our guys will be so it ultimately will com back to what's hurting Rodgers on the Packers, nobody to throw to because nobody respects their running attacking.
And opening a hole in the middle of our D-line, I don't think I have to explain why that's a bad idea.