Probably inevitable...
It should be matter of more surprise that much of the contemporary technical world is interoperable.
Its not that long ago there were a few incompatible proprietary networking technologies (physical to presentation layers.)
Television PAL/SECAM/NTSC and even POTS telephone system. Not forgetting the 240/120VAC/50-60Hz mess.
If the PRC and its BRICS mates want to take their bat and ball and go home the EU, US, CA, UK/AU/NZ etc will have to arrange to manufacture their kit somewhere else. The remainder will have to choose.
The likelihood of two such adversarial blocks sitting in good faith on ISO etc standards committees to ensure interoperability is almost certainly nil.
I can understand this outcome could be financially disastrous for entrepôt nations like Singapore. Not forgetting that many global TW, KR and JP tech corporations have considerable investment in manufacturing and markets in the PRC who will suffer considerable loss of assets and sales (as will many US companies.)
One point the pandemic made clear was that tightly coupled, mostly irredundant, systems are extremely vulnerable to disruption. After decades of dismissing the globalization sceptics' arguments the hasty, disorganized, uncoordinated rush to national, or nation block, self sufficiency (or technical sovereignty etc) with equally little thought of the consequences is likely to result in tears and the return of extensive trade restrictions.