Comment by meowface

It seems likely that at least for a few more centuries, humanity and Earth are going to play the typical geopolitical games they've played during the past centuries.

China and Russia are consistently led by ruthless people who like power. Plus, even if China does only just conquer Taiwan and then leaves everyone else alone as the hegemon, there's still the matter of them oppressing ~20% of the humans on the planet (their own people). Even if it's the sort of oppression that you don't necessarily ever notice so long as you always stay in line.