Diaghilev was the first to notice good character dancers and that sort of thing.
Nearly everything in life goes in threes and fours.
Classical ballet will never die.
Nothing is done easily, first have the thing, then the thing has a success, then all sorts of difficulties arise through the success.
It's either not good enough and dies altogether, or it develops.
As time goes on, all schools only get left alive if they have found something special themselves.