With Marvin's contract expiring the best we can hope for is that he gets offended by Mike Brown's low ball offers. I don't think there is any way that he doesn't get offered an extension. We just have to hope that Brown decides to go cheap, which in turn won't bode well for the next coaching hire.
I think the most realistic outcome will be that Brown sticks with his current offer, rumored to be an extension at his present rate of pay, and Marvin returns with some changes to the coaching staff. Possibly a new OC can at least coax the best out of Palmer who is still in the top half of the league and should not be the reason this team fails.
As previously mentioned, this team plays so ugly that I don't care whether they win or lose and have reached the point where I don't want to watch. Unfortunately, my second favorite team, the Texans, is equally frustrating.