The smart thing to do is to keep him. Anyone who has watched the Bears knows he hasn’t been the problem. The Bears receiving core last year consisted of Darnell Mooney as the WR1 and a bunch of other no names. Bears defense ranked dead last a season ago and that continued this season up until maybe the 5th game.
Much rather have an improving Fields with Moore and another elite receiver, a shored up offensive line, and help to the defensive line PLUS more draft capital (like a similar haul that we got last season. You draft Williams, you MIGHT get a 2nd rounder for Fields, and then you have the 10th pick in the draft. That isn’t enough to improve the team, and we might get even worse, killing all the momentum. Fan base would turn on Williams (they already think he’s soft and a prima donna) even more than they did with Fields (as most are starting to come around on him). Also, all his teammates love him and he's a leader on this squad. Would Williams command that same respect?