The US Defense Department’s grand strategy for protecting Taiwan from a massive Chinese military offensive involves flooding the zone with thousands of drones.
More like defending TSMC... large majority of all high-tech silicon is made in Taiwan. If that foundry burns, the consequences would be astronomical. The possible consequences are already at a point they could make threats via self-sabotage.
If the hellscape thing comes to pass the structural integrity of any building is probably going to be the least of anyone's care. Like a drone walk is not going to make people happy about going into a clean room for an entire shift. That will end shortly.
The much more possible possibility is that the plant moves to the US with newer machines.
There are no newer, or any other machines at the level of the tsmc plant. They cost multiple billions for each production line and require parts that take ages to produce (like zeiss mirrors for millions a piece)