I have a pretty good guess what will happen. There's two ways this will go and if you look at my post history, it hasn't changed in my predictions since before the season start.
Best case scenario - Pete is fired and the offense goes from bottom 5 to mid 20s. They do this, the team will eek out a few wins against bad teams and get close to .500 but won't make the playoffs.
More realistic scenario - Players lose all faith in Allen and the defense gets sick of the offense and falls off and this team limps to 5-6 wins and Allen is canned.
I don't think there's any scenario where Allen is fired mid-season because there's no viable replacement (maybe Marrone) and Loomis won't do that. Really no point in doing that anyway. Let him implode and purge them all.