I have to disagree with you there. I don't think Chen Shui-Bian and his cronies have any intention of reuniting even if China is democratic. Their view is that Taiwan is a separate country and even race of people. They've been doing that in the elementary school systems for years, wanting to remove ROC from the title and change it to ROT (Republic of Taiwan instead of China). Fortunately, Taiwan didn't lose its sense and defeated the DPP's proposals in the last election.
So I don't think that by itself will change the issue. It may reduce tension, but if Taiwan is still unwilling to reunite, then I am almost certain that even a democratic China will use force to prevent independence.
The next move will be on Chen's. If he moves towards independence, then I'd agree with you that war will break out over Taiwan.
The people apparently think differently and would reunite with a free mainland.
I expect if the mainland were to become truly free...that the free people on the island would force their politicians to move towards unification (or elect new ones who would) because they would all benefit tremndously...at least that was the feeling when I was there amongst the managers and executives I consulted with.
If the CCP stays in power and is successful in their moves towards ardent nationalism based on a totalitarian system...then reunification will only occur at the point of a gun IMHO. It is this danger that Chen is buttressing and trying to prepare against IMHO.
We shall have to wait and see...and all pray for the true liberty and freedom of the Chinese people and the attendant avoidance of conflict.