That presupposes that these countries are willing to be in a permanent state of war with China, which is highly unlikely.
Firstly, how are they sure that China will agree to fight them only around Taiwan. Even if China does not strike at US homeland in retaliation, what makes these other countries sure that China won't strike *them*, especially Japan?
Secondly, the fighting around AR will end at some point. These countries still have to live with China after that. Say China repels the intervention and completes retaking Taiwan. Then what? Do they just say GG to China and try to go back to life prior to AR? Or, suppose China fails in the first attempt because of their intervention. I doubt CPC will fall because of that. More likely, whole of China will galvanize behind CPC for round 2. Like LKY once said on this matter, China will keep coming back and eventually China will win.
Of course China should plan for the worst case scenario, but I don't think such a scenario will come to pass.