He can....and he's had that during Wigan's relegation. A sign of a good manager is being able to adapt...if he doesn't, he's not a good manager and therefore he can't have another bad season..
....all imho naturally
Thats all a bit relatively speaking though....arent Wigan a team you would have expected to have gotten relegated eventually. I dont think it was any great shock. He did win them a cup in the same season though.
You can check out the CV of many a top manager and find examples worse then relegating a relegation material team and having half a poor league season with a team that regularly spends half the league season playing poor!
Patience, and all will be revealed.