If they get relegated, they've made the wrong decision.
It would mean the manager they replaced Hughton with had failed. It could also mean the quality of the other teams in the Premier League had improved (for example NUFC scored more points this season than last season but finished in 13th when it was 10th the season before).
If the manager who replaces Hughton fails - they've made the wrong decision.
Alan Pardew and Steve Mclaren didnt get us relegated, Rafa did...