Russia and China can't fill that void.
China has significant industrial output, but still most of the machine tooling, CNC machines, industrial robots, they either come from Germany, America or Japan, good luck running a factory for long without spare parts or maintenance.
Germany has suffered the largest deindustrialization since the aftermath of WW2 simply due to companies unable to have access to cheap Russian energy, and Russia was responsible for "only" 30% of that energy.
We would be thrown into post plague peasant tier levels of living standards if any of those 3 countries collapsed overnight.
Even a decay of one of them (America)) is already enough to throw the world into shit, there's been more violence and wars in the past 4 years than in the last 20 years, more famines and disease and refugees as well.