There are several things at play here, and going in different directions:
1.the PRC's window for invading Taiwan is closing due to internal demographic issues
Even with a low birthrate and an aging population, China on aggregate still has more healthy young men to spare than any other country in the world bar India. Doesn't seem like that would be an issue.
Anyway, I voted "no" with regards the next few years. I'm inclined to think an invasion would be a pyrrhic victory wherein China conquers Taiwan but plunges itself--and the world--into a global depression.
Poll
