While I think Mayo will improve next season, I doubt it'll be good enough for the team to become a true contender in the near future and I would prefer they dump him now and get a head coach and coordinators who are ready for the big time from day 1.
That said, it doesn't seem like ownership agrees. It seems very likely Mayo and Wolf are here next year, no matter what happens the rest of the way this year. Since that's the case, I have to hope there's some plan in place to make this coaching situation functional.
I think if they can figure out something to improve the defensive play calling/adjustments and inject a lot of free agent/draft talent at all levels of the D, that will go a long way. On O, if they get a real WR1 in free agency, a WR coach, and some better pieces on the line, they might be good enough to win some games. And if Mayo will stop saying stupid things and making questionable calls in the few choices that are actually up to him during a game, that might be good enough for playoffs next year. If that happens, won't we have to judge Mayo as a success?