Your trying to pigeon hole EJ into a sub par category. I think that is shame. He may light it up next year. You also don't seem to remember how the Patriots defeated us just a couple of weeks ago(with the run and with special teams). The running game is still relevant though I agree the pass is becoming much more important across the league.
There is much more to football than just capitalizing on the passing game, though. We have fallen short this year and a big reason for it is the passing game(I will give you that). Even still, looking for the knock out punch of a top QB isn't the only way to get to the post season. Our team has a run game which will complement the passing game and a defense that can stop the pass. Just a moderate improvement in our passing game and an improvement in some other key areas like special teams or stopping the run can push our team over the top. If there is a team that doesn't need a Payton Manning, it's this one.
After some time to cool down a bit after missing out on a playoff spot, then and perhaps especially, after losing to the Patriots(that game ticked me off because Brady's passing had little to do with the loss), I am able to look at the whole picture a bit more clearly. I see a Bills team that is on the rise. There are some deficiencies and passing is one of them, but we don't need a 5000yd passing year to get there. We can do it with mere competent QB play. I think EJ is more than capable of getting there. Of course, it remains to be seen how much more capable he will be.