In a hundred years this will likely not be relevant, since the periodic elections will eventually have to go giving way to more flexible and internet-enabled mechanisms, and it's not given that mainland China will be lacking those.
I'm not sure you can call yourself choosing the direction of your society if "reuniting with mainland" is the direction you are not allowed to choose.
So Taiwan/China can reunite as long as the Taiwanese democratically vote in favor of this. Seems fine to me, as long as that’s the condition. I’m not sure what the Internet has to do with elections, nor how it is going to solve the problem of an autocratic Chinese state, but speculative fiction seems fine on HN.
