They won't do anything with Barry unless the defense goes completely in the dumper, which I doubt happens. They have a soft-ish schedule. This is the last year of Barry's contract, they'll let him go and move in a different direction then ( i.e., "Pettine him")
I don't think Gute is impressed with what Barry has done with the defense so far, and MLF is a bit irritated with their underperforming as well. They aren't going to can him mid-season unless it's bad though. It's not the way they operate.

Also, no to Gregg Williams. That dude's time has come and gone, and I suspect there are still a lot of people who remember him from BountyGate and would rather not see him back in the league. There will be better hiring options available at end of season