Of course, if that was to happen, it could always be changed back.
I don't always go along with that range of thinking. Just because something isn't "broken", doesn't mean that something shouldn't change. It's really all a natural part of evolution. Look at it this way, in the olden days people used wagons pulled by horses to get their goods from place to place. It did the job, but when the lorry came, the wagon was stopped being used. Not necessarily because of it being "broken", but the fact that something better came along, it was time to move on and use something else.
And so it is with this. At times, the 4-2-3-1 formation being used by ICT is seen to be ineffective. Rooney at times is ineffective due to being completely isolated and a lack of support. I read an article a couple of weeks ago about Johan Cryuff (who obviously played and managered using a straight 4-3-3). I recollect him saying that in the 4-5-1 if the striker gets the ball, who does he pass to? And it's the case here. I've seen Rooney pick up the ball many times and lose possession, by no fault of his own, rather via a lack of support. This formation has been used by ICT up until now, but it's time to go out and win this league through courage, attack and determination to score as many goals as possible. That isn't as possible to do, using this formation. It's time for a change.