If you somehow think it won’t happen it’s you living in a dreamworld.
The last waterborne invasion of that kind of scale was D-Day and if anything things would be tricker now that anti ship missiles are rather effective.
I mean the communists have wanted to take over Taiwan since 1949 when they took over the rest of China but the sea remains a barrier. It's quite possible that rather than Taiwan falling to the commies, it will be the mainland that gets taken over by democracy.
I think Taiwan needs to show more preparation and resolve. Maybe this election will change things and they will spend more on military. Mostly by stockpiling shells, missiles, mines, and food. Taiwan has advantage that they can build own missiles since few will sell to them.