A quick glance at the IST timeline - I have the PDF in my dropbox account - verifies that the situation between Taiwan and China in the 70s went down pretty much as in the real world. The government of Taiwan held the UN seats for China, until the place in the UN was handed over to the People's Republic of China in 1971.
It totally makes sense to me that at least someone would try to start the ball rolling on readmitting Taiwan to the UN, sometime between China's diplomatic meltdown after Tiananmen and the present day. It would probably take some time, so it's realistic that the trigger for conflict is only some 10-15 years after Tiananmen - it took a long while for Taipei's hold on the China seat to shift to Beijing, after all.
-- Acyl
It totally makes sense to me that at least someone would try to start the ball rolling on readmitting Taiwan to the UN, sometime between China's diplomatic meltdown after Tiananmen and the present day. It would probably take some time, so it's realistic that the trigger for conflict is only some 10-15 years after Tiananmen - it took a long while for Taipei's hold on the China seat to shift to Beijing, after all.
-- Acyl