I agree with the premise, but disagree with the point. QBs can't single-handedly get your team in the playoffs, but they can nearly single-handedly win championships. And most importantly, a QB that's less than really good can't win championships. You obviously, have to have the team around the QB to get to the playoffs. But most times it doesn't matter how good the rest of the team is if the QB isn't up to par.
The last 10-15 years, the AFC has been represented in the Superbowl every year by Tom Brady, Peyton Manning or Roethlisberger....all probably HoF QBs. The NFC SB teams have had many different names, but all of them had either MVP caliber seasons or played like MVPs in the playoffs (Rodgers, Wilson, Newton, Brees, Eli, Ryan, Warner, etc). Not all of those teams had good defenses. Not all of those teams had a ton of offensive weapons. The 1 common denominator they all had is behind center.
And I agree, you won't see QBs having that much impact on their teams because the league is more scheme based than player based at this point (though I'd argue Cam Newton impacts as much as Brady/Manning, MVP season = Superbowl, bad season = top 10 pick). The players that transcend scheme are getting old and going away, as are straight pocket passers. Now it's about putting QBs in the best position to succeed. I completely disagree that RBs will come back into style when those QBs retire. All you have to do is look at the college game. They're running spread offenses. RBs aren't winning Heismans anymore. This isn't going to change anytime soon.
All that being said, my point all offseason remains. While it would be nice to add the top S, CB, or DL in this draft and build an elite defense to go with what looks like a potential elite run game. You can build a defense with players outside the top 5. You can't build offenses without a QB. The later in the draft you take a QB, the lower chance you have of getting a good one. This is the earliest the Bears better be picking in the forseeable future. Not saying if they pick a QB at #3 he will definitely be good. But if they pick a QB anywhere after #3, he will most likely not be good, because he won't be the first.....typically where you find the best QB, if you know what you're doing as a GM.