If Ferrer gets there - He deserves it. That guy is a credit to the sport.
Of course, but realistically it wouldn't last long. Andy has got to no.2, if he should lose it, and I think it's fairly unlikely, I'm certain he would get back there quickly.
Either way, it isn't an issue yet. If Andy played every match with his ranking in his mind it would be a mistake. He knows he's better off concerning himself with winning, then the ranking will look after itself.