The thing is they want the super league AS WELL AS the prem. They basically don't want to have to work to be in Europe.
Man United have zero form of European competition next season (unless they beat Man City, somehow) and there is a somewhat real possibility that they could be out of Top 4 for a good while. They won't want that. Even the foreign teams won't want that. They don't want to rock up at Villa Park or Selhurst or Brighton. They want the "big boys", even if they lose.