I think the fact the EU steuggles as much as it does in the near future they would be at best a weaker China. Lots of bodies but sub par military capabilities. The benefit we get in the US is that we'd only need to come in as support and military guidance rather than sending a lot of troops. They will still suck at doing things as it will be military by committee so in cases with countries like Russia they will most likely defer to the US to just run things.