I was joking with Main Event in another thread about how Roy Keane should have come at United to be an assistant and then take the coaching job once Fergie leaves. (it could still happen in 2 or 3 years if sir alex ever leaves) As for Phelan, I think he'll be a very good assistant.
You think Keane will replace Sir alex in a couple of years time, I don't think so after his dealings with Sinderland at the moment he is too loyal.