The Sanchez saga is brilliant for us. It sucks plenty of money from their wage budget which could have been put to better use. Nobody will pay him those wages, so he is there for the long run. Even if he tries to do a Rooney and move to his boyhood club, they will still have to pay part of his wages.
It also is a good warning for other players that City while offering good money, offer even better footballing reasons to join. Better to make your own history rather than sign for a club that is history...