It's the nature of any sport.But you have to innovate in other areas too. The amount of revolutions in the air a human can do is limited and nothing increases in a straight line over large periods of time, but in waves. Some skaters could land 4As or 5s and afterwards a regression could happen in the sport related to jumps. Unless the human species will evolve into a different species more adapted to rotating in the air and fighting gravity like a bird or something, but that happens in aeons and usually after a great extinction if at all (possibilities slim).
And let's not forget the pressure on the human body a 5 or 6 revolution jump would mean. Seeing people so badly injured that their lives are changed forever is not how it should be IMO and we've seen that in gymnastics I think. Or them having a competitive career that is spanning 4 years or less because of the grueling nature of the elite level sport.
). I do hate the version that Kostner skated to though. Now THAT was dull and monotonous.