This is very true! Which is why this is a fine balancing act on Taiwan, and not the simplistic 'hurr durr US interests can't allow that'. They need to carefully weight their options, and decide what is best for their nation under the circumstances.
The US absolutely would be very carefully considering options.
Their primary preference would be for no conflict, so they put up a front of bravado to discourage any aggression. He question does remain, if they'd actually respond to such an invasion.
