And yet P/K still won medals in both their GP events and went to the GPF in their debut senior season, something B/K couldn't do. Not too shabby for a team with skating skills "not good enough."
As for other young teams and staying junior or moving senior I don't see any reason to rush. They are all very young and still have all the time in the world (a lot of senior pair teams last well into their late 20s or early 30s). They should remember the end goal should be the 2022 Olympics and even the 2026 games, not 2020 worlds or other senior competition. If they are that talented then waiting another season isn't going to kill them. It will only give them the chance to build a bigger reputation and hype. Build great hype in the juniors and the senior judges will reward you even if its your debut season (just look at the Russian and Japanese ladies for example).