They do realize that Japan at a minimum will roll with us, right? Possibly even South Korea, and India as well.
It's high-key also too late for us to abandon them because, like another poster said, they produce the vast majority of our chip tech.
Plus, surrendering Taiwan pretty much leaves the rest of southeast Asia open because if we didn't challenge China on their #1 priority in terms of military operations, then why the fukk would we challenge them anywhere else besides Japan and South Korea?
Edit: and war is gonna break out sometime this decade or the next. I predict somewhere between 2025-2035.