Money really doesn't matter to them , does it? Anyway they'll have the same problem as last season, they will concede silly goals. Comparing to them is pointless though, the league is won by winning against all teams, not just one another. And he'll still be vulnerable to counter attacks.
If he doesn't lead them to a league title, or CL final after having spent a shitload of money, he'll be considered a failure. Tbf, I think he'll himself leave if he doesn't win anything.
Good thing for them is most of the players he bought are at least young, so they'll be there even after he leaves. It's almost FM like, the way he's stockpiling the young talents