Agreed, but his transfer dealings in the Summer weren't exactly stellar. too much time chasing Everton players.
Surely he should have seen Ferdinand was already past his best by a long way, Evans and Jones are not top 4 central defenders (maybe get away with playing one of them with a quality CB, but both together?). Also Carrick, Cleverly and Young have been overhyped for years and are not good enough as a group.
Either Man U give him the Summer to bring in some quality to address the above or get rid now. If you were Man U would you trust him to rebuild?