They already have a ways to go to catch 2016. Goff and Wentz are pretty good. For all of you other Bears fans: What have you seen that says WOW out of Trubisky? What throws has he made that made you say HOLY CRAP I CAN'T BELIEVE HE MADE THAT THROW.
There are no "wow" moments, which makes me believe that him being average is the most likely outcome, with his ceiling being a notch above average. You pretty much need a HOF QB, or at least a QB who had an MVP type season to win Super bowls now. People talk about NBA Hell a lot, but nobody talks about NFL Hell. NFL Hell is having a QB that is too good to let go, but not good enough to win a SB without an elite defense carrying him. See the Cowboys with Romo, the Chargers with Rivers, etc. Teams have to realize at a certain point that their current QB isn't going to cut it in the playoffs, and cut bait while that QB still has value to a team with an elite defense and a bad QB.