I've been wondering about the money situation. Ronaldo will undoubtedly cost a fortune, but who exactly says we can't afford him? If Sir Alex makes his case to the Glazers, could they not allocate the funds? I'm not really sure how it works with the money, but I do remember a few months back a report coming out where Sir Alex said the Glazers have never denied him his requested transfer money.
He would probably cost less than many expect. First, Madrid generally don't sell their players at above Market prices. Second, he is nearly at a point in his career where one could say his best years are behind him. Third, (a big IF) he may want to return, which would basically force Madrid's hand, just as it did Fergie's. Fourth, Mourinho's likely departure at some stage will probably play a role whether or not Ronaldo stays. A change of managers would present a clean break opportunity for him to switch clubs.