The idea that the US protects Taiwan from a possible Chinese invasion over chips is one of those things that sounds believable but really isn't going to happen. From China’s perspective, the cost of war is much higher than the cost of developing these chips themselves. In the worst-case scenario, they would be 2-3 years behind the cutting edge, which is not mission-critical. Most electronics (civilian or military) do…
That is extremely unlikely to happen, Taipei has invested a lot in defense, and until lately the public in Taiwan at least says they would fight[1]. It's extremely unlikely that they will fold so fast that the US won't have to get involved or to choose to not get involved.
> 3. Taiwan successfully defends itself, repels the Chinese invasion, and possibly even takes back some territory.
That won't happen either. China has an incredible manpower and material advantage, they are unlikely to be effectively defeated. Even if Taiwan can deny the channel and prevent a landing they will still be effectively blockaded.
> 2. Stalemate. Taiwanese people fight bravely, and Chinese forces turn out to be weaker than expected. In this case, the US would be in a comfortable position to send aid and weapons to help Taiwan, prolonging the war to weaken China. With some luck, a regime change could happen without firing a shot.
It will take weeks before we can tell if there is a stalemate or not, and the stalemate will not be stable. If the Americans try to provide aid they will have to cross the Chinese blockade and they will have to fight to do so.
[1] https://www.dw.com/en/most-taiwanese-would-defend-island-aga...