As I said to Sults, we have a long list to go through if that's reason enough to become the United manager. Start with Giggsy and then we go to scholes, the Nev brothers, becks, butt, etc. That's a decade or 2 sorted regardless of how they perform considering how tough it'd be to sack them if things didnt go as per plan.
Simply put, he has to earn the chance. Just like the likes of Ole are doing and the likes of Bruce/Hughes failed at. You dont appoint someone manager just because he's a club legend.