It's a matter of timing: China demography is a tenable issue for now, they lack women for some generations, some still sexually active some not anymore, but the

It's a matter of timing: China demography is a tenable issue for now, they lack women for some generations, some still sexually active some not anymore, but they survive it, they'll probably hardly survive the aging population after 2035-2050 because automation evolve fast, but definitively not fast enough and they probably fall a bit later due to degradation of schools. USA have a significant natural margin: they can grow, they can feed citizens, but the scholar decline and the overall technological decline it's hardly reversible, not only Western Europe is in a worse state FOR NOW, but an hypothetical UE+EAEU would solve most UE and EAEU issues, politically, socially, is very unlikely but technically is very possible, and while the EU education is demolished most of world high tech it's still there. So in the very probable III world war it's not so unlikely the EU under the pressure of deep social unrest leaves NATO/the anglosphere, to reunite continental Europeans till the Urals, so opening the gate of Central Asia, the part of the world ALL current superpower look for.