I had friends in Taiwan construction industry. They said TSMC will pay them extra just to make the construction time shorter, even 2x the cost. So you see firms love working with TSMC since they can get higher margin than typical factory construction.
The current most advance fabs are place in Taiwan ( along the coastline which is nearer to China ) if those fabs are destroyed, there will no longer be newer CPU generation for a decades due to the recipe to make these chips are lost in war. Companies which relies on the advance of semicon will halt but will eventually recover as other players ( Intel, SMIC, Samsung or the parts of what’s left of TSMC ) catches up with progress made in the fabs in Taiwan.