Trading Howard for Foles would be the riskiest move imaginable but the potential for a monster payoff is immense. What if Jared Goff or someone goes down for the year? The Packers, Chiefs, Saints, Seahawks and Patriots would probably just give up if they lost their QB for the year...but everyone else? Man...they would about give the Bears anything if they thought Foles kept their hopes alive.
The downside is if nobody gets injured the Bears traded a stud for somebody who probably never sees the field (unless Mitch gets hurt). Risk factor: over 9000. I wouldn't do it, but its a thought.