Well, something had to switch, as was clear in the article from the UK that I linked above in the thread, or ice dance was going to be thrown out of the Olympics if it didn't get some other system that appeared to the IOC to be more objective than the 6.0 system.
COP was the brainchild of the ISU-they didn't have any other proposed systems at the time the IOC was demanding more sportiness and objectivity from the subjectively judged sports, like ice dance. So COP it was.
However, COP is not some monolithic thing. In fact there have been 30 pages of changes or more to the ice dance rules for COP every year, and it costs me a significant amount of time to keep up with them each summer.
Indeed, at any time, the ISU could choose to change either the internal rules to COP, or choose to scrap COP entirely, but they still would have to maintain the appearance of a sport based objective judging system. Consequently, Anissina era style programs, where one member of the team is a weak skater, is unlikely to happen again.
On the other hand, Klimova/Ponomarenko, Usova/Zhulin, Torvill/Dean and Grishuk/Platov would have had winning results if they had competed under COP, given a year or two to train a very few skills (more complex lifts & twizzles).
However, I would not think that Fusar-Poli/ Margaglio would ever have been world champions under COP.
Which is all good
At the time COP went into place (2004), and up until the 2006 Olympics, the only team training in Canton that was at any elite level was Belbin and Agosto. So although the Canton & Detroit coaches are doing well at the top of the standings today, it is because the coaches in that area learned to exploit COP better than the coaches in Russia, Newark Delaware, Lyons, France, and at Astin Mills, PA, not because they created the system. They didn't.
The Russian coaches didn't create the COP for singles skating, but it is their young ladies poised to take over their discipline.
How did that happen when the US ladies' coaches had the most winners prior to 2006? It's because the US coaches have still not learned how to train our young ladies to jump off the correct edges, with power, and no underrotation, as COP requires. My guess is that because they had the winners under the old system, they thought they knew everything, but it is clear they did not.
The same is true of the Russian dance coaches who stayed in Russia and Linichuk here in Astin. They still have not caught up with the new system the way Zoueva & Shpilband and Krylova & Camerlengo have.
That is not the system's fault.
And it is worth noting that all of those 4 coaches were not Americans or Canadians when they learned ice dance.