I agree, it would be pointless without the Troy/Gabriella love story!
Besides, I can't really see this as being true since Vanessa just signed a $1m deal with Neutrogena or whatever it was, proving that obviously no one really has an issue with the naked photos thing. Disney would be shooting themselves in the foot, plus, what are the chances of Zac Efron wanting to be in another movie without his girlfriend, particularly since he's not keen anyway? Doubtful!