China will just send 15 million civilian internal migrants in the first wave. Armed with cameras, megaphones, and CNN uplinks.
I say Taiwan will invite them in after a 1 year blockade.
China could probably enforce a blockade...at least to the extent that standard commercial shipping and air cargo would be stopped.
Invasion is a bridge too far for them.
90 miles of open ocean is a shooting gallery for stand off weapons. And everybody has them.