COP came around at a time Kwan was dealing with injuries that made it hard for her to contort her body to get those highest level spins. I think the spirals and footwork she could have adapted fine to the current rules, but the spins would have been hard since her injuries would make what was required of the higher level spins painful perhaps.
I am not sure jumps are the biggest problem. COP does not reward a triple-
triple as much as one thinks. Lets say you have a program with 6 triples and a double axel to start, you change the double toe at the end of a jump combination to a triple toe, assuming the triple you were already repeating wasnt the triple toe, you only add 2.7 points to your jump value score. Then lets say your initial 6triples with a double axel program had included a solo triple toe, before adding the first triple-triple. You then change the other combination that ended with a double toe(presumably you had a combination with double toe-double loop on the end, another with double toe on the end, and another with double toe on the end, before adding any triple-triples)to a triple toe on the end, and replace that triple toe with a double axel. So you add only another 2.0 points there. So that is a gain of 4.7 points for two triple-triples, before bonus possible bonus points come into play if these changes are made no jumps added later. Even then the 10% wont gain you much extra, you are still only 5 points and a bit maybe with two triple-triples, or around 3 points additional with one triple-triple.
The combinations with a triple loop as your second jump of a triple-triple would gain you a bit more then the triple toe on the end. Even so it is still not nearly as much a point differential outright on jump value as some seem to believe. Maybe the belief is it creates a dynamic and spectacularity to your performance which boosts your PCS and even general GOE scores.