Don’t worry, Intel is expanding foundry capacity for this case. Apple SoC will stay on the same node for couple years, but that’s not an end of the world for consumers.
TSMC also has the WaferTech fab in the US and is currently building fabs in the US and Japan. I imagine geopolitical diversity is one goal in the placement of those new fabs.
But it'd still lead to a massive global chip shortage if TSMC's facilities in Taiwan were wiped out. And I guess that is a deterrent that Taiwan can use against China.