Past performance doesn't guarantee future performance. Otherwise xkcd https://xkcd.com/605/ would be true.
Love it!
Sadly, your comment lacks any substance to argue with, all there is are unsubstantiated ad hominems. Sad.
It's also two different things, you might be right that China, Russia or the EU would be worse as a hegemon, but that doesn't imply that it wouldn't happen.
Being a realist would imply that you would understand that a fundamentally worse hegemon could still replace an existing hegemon.