I don't think the Rooney and Ronaldo situations are similar.
Ronaldo, always had his heart set on Madrid, essentially saw us become the strongest team in Europe.
Rooney handed in a transfer request, bemoaned the lack of quality signings. Got his pay rise, and shut up. Two years down the line, he asks to leave again.
I'll tell you one thing, if Rooney leaves and ever returns to Old Trafford with another club, like Ronaldo did with Madrid this season, he won't get near the same reception as Ronaldo got. Probably boos.