Bah, China will never invade Taiwan. First, Taiwan is so fortifide that doing it will result on heavy losses on both sides. And second, China WANTS Taiwan... they want it's economic and industrial structure... invading it will most likely destroy those, and what use would that be? Not only do you lose the reason why you want it, you also turn the locals towards you, and they'll hate you. They want a peaceful transition like Hong Kong.
I'm confident Taiwan will return back to China in time... maybe 10-15 years, when they start to see that Hong Kong actually does well under China, they'll see that so can they.