While I think Fields will keep improving, I don't think he'll improve enough, especially not fast enough to keep the jobs of the coaches/GM they currently have.
If I'm the Bears GM, I'm grabbing a QB, and while Caleb headaches stuff is going around, I think he'll be fine as long as the team is winning. If they aren't winning, I think that could be an issue. But what's holding the Bears back the most right now?
I'd say it's their linemen (both sides) and then QB.
So I think they have to go with a QB in the first round. Since this year is loaded with more QB up top than normal, they could still potentially trade back and get one. But they have to grab a QB in the top 16 overall.