If foles continues to play well this year I think you can wait until the following year to draft a QB.
Invest that first rounder in a left tackle.
Agreed because I think a lot of people don't realize that at the start of this season, there were only 3 QB's that most "experts" have pegged for the first round: Lawrence (Clemson), Fields (Ohio State) and Lance (North Dakota). Other than that, no one had any other QB's in the top 30 picks. So, unless the Bears either royally screw up and finish in the top 5-7 range, they can only hope to pull a Green Bay and draft Lance at say 15-18 range. However, with the way the schedule shakes out, Bears very well go 10-6 and are in the playoffs which means they will draft too late and don't really have the draft capital to move up.
So, now you start looking at 2nd/3rd Round picks and that leaves us with Purdy from ISU, KJ Costello (Stanford/MSU), Trask from Florida, Ehlinger from Texas or Mond from A&M. So, really, its a piss poor draft class after the First round. If pushed, I would probably look at Costello as long as he continues to produce at MSU. Has the size and intangibles to be a starting NFL QB, just was never asked to do a whole lot at Stanford.
If I am leading the Bears Draft room I am looking at Offensive Line, Linebacker and secondary in the first 2 rounds. Keep building that quality depth and if Costello is there in the 3rd, take him.