I don't know whether he'll get offers. There will be those teams who see his Denver tenure as a total failure, and thus stay away from him (that one year in St. Louis too), and then there will be those teams who are desperate, will see how well he seemlessly returned here, and be willing to give him another shot.
I hope he stays here for another few years rebuilding his resume and reputation with Brady. If nothing else, a few jobs come open every year, and why not put some distance between yourself and a couple of bad years, particularly when you have a shot to look spectacular in the process. You might get this gig if BB decides to pack it in, or you will be sought after at a premium. Right now, you'll probably get a low ball offer, with a reminder that this new team is taking a real chance on you after your last debacle. The longer you stay with the Pats and they do well, the more likely it will seem that it was not YOU that went wrong in Denver and St. Louis, but those franchises.