> There is simply no way the west will always rely [...]
This is the "on an infinite timescale" argument I think. It's been decades now that we rely on Taiwan, and the estimate give a few more decades to catch up if we start getting real serious about it right now, assuming Taiwan doesn't keep its lead.
So yes, eventually things might change. But that won't be tomorrow, or the day after.
The US might be able to defend Taiwan from being conquered, but nobody can protect the fabs from being shelled.