I don't think the only alternative is "replace the US with a different (evil) power". An alternative is that the UN plays more of a policing role and we move away from power and justice being applied unilaterally and capriciously. In no way am I suggesting that this is an easy thing to do, or even neccessarily to be desired, but the idea that the world being run by China-Russia is the only alternative to US hegemony is a false dichotomy.