Although, looking at the Taiwanese military training, they can do a lot with that. And once (if?) they get the Aegis capability they shall have even greater efficacy. However, should anything go wrong, they better not be hoping for direct military assistance.
The greatest thing preventing Chinese attack right now are the twin facts that the Chinese are not ready (things are not yet optimal for them economically, in terms of war scenarios, and militarily), and obviously the Taiwanese Strait. Thus the most they can do about their, scoff scoff, 'renegade province' is just sabre shaking (with Taipei mirroring them). However should something change, I would love to see the congressman or woman with the integrity to stand up for Taiwan in front of his constituents. Bush has the integrity, but few congresspeople would support military action that would not touch the minds or hearts of most Americans.
I hope that encapsulates it.