The thing about Rooney is that he'll want to play and play well wherever he is this season as the World Cup is on the way, with him being English and the prospect of him being back in form trying to impress for the World Cup his marketing value is next to none, especially with him being English.
An inform Rooney is hugely marketable and is something we were missing last season, I don't think we'll sell because of this. If he impresses then we're in poll position to offer him an extension next season, if he does want to leave then we'd have just had a good year out him (a crucial year with it being Moyes' first) and could potentially trigger a bidding war between some of the bigger clubs who don't seem interested this year and if he does have a lacklustre year then it won't be such a problem getting rid.