I think China is changing and might eventually join the US, or at least take an external role in stopping violence.
It was originally allied with Russia and NK, but they've proved to be poor trading partners and disruptive on an international scale.
Events like the Kunming attack has shocked China and they are starting to take an offensive rather than neutral role to terrorism. So they could potentially get involved in Iraq and the ME (which is pretty much a never-ending conflict).
I think China could officially gain superpower status when it ends the conflict the US is failing to stop. Plus I'm pretty sure they could do it if they try hard enough.
Russia however is sadly just spiralling downwards due to its shoddy organisation, leadership and disruption in international affairs.