I don't think that's obvious. There's some thought that it may be best to confront China now before they become a superpower, because afterward it would be obviously "No." Taiwan is more critical than you may think. Both Japan and South Korea have assurances of US defense as part of our non-nuclear proliferation pact. If they see us drop the ball on Taiwan, then they know that assurance means nothing. North Korea also knows it can take more aggressive action once the US has revealed its hand. This is not a position the US wants to be in. In the end, I think the US would be forced to aid Taiwan against China much like it has been doing with the Ukraine against Russia. Which is one of the many reasons why the Ukraine is so important.