'Literally' lost his marbles?
I'm sure he wouldn't see any of those players, or Macheda, as direct replacements, but he may feel that at least one of them is ready for the first team, and there comes a point in the development of a side, when you have to back a youngster.
I suspect he's disappointed with Berbatov's attitude. There was a spell at Spurs where Berbatov was playing with a lot of determination, and it was on that form that he paid £30m+ for him. I don't think he's shown that for Man U, and Ferguson clearly doesn't feel he can be trusted to rise to the occasion in the big games.
Watching the final in the dressing room at Wembley won't have impressed either. He should have been big enough to go out there and publicly stand by his team-mates, no matter what he was feeling.
What's wrong with Berbatov's attitude? He's been great for Man U this season and has seemingly been happy to come off the bench and play well when players like Park have got the nod instead.
Ferguson has a long history of this type of nonsense when he suddenly doesn't fancy a player. He did the same with Van Nistelrooj in 2006 after he'd started the 05-06 season on fire.