Long term: demographics are worsening for China relative to now or 5 years ago.
Short term: China doesn’t yet have viable homegrown replacements for ASML, TSMC, etc.
Really short term: China blockading Taiwan and suffering the economic fallout would be much more painful than US blockading Cuba/Venezuela/etc.
A decisive kinetic action or a very soft political action, rather than a blockade seems more viable in the current state.
It’s very possible that they will be able to dominate South China Sea and their zone of the Pacific, even now, given the proximity advantages and ship/missile production; and I think that would be satisfactory to them.
20 years from now, China’s sphere and America’s sphere are separate, with China having a lead in competing for Africa, and Europe in a very weird place socially, economically, demographically, and WRT Russia/US competition.
I'm not like, rooting for this, I'm just trying to be realistic.
The US has an embargo that doesn't impact other countries that want to trade with Cuba. China is going to put an actual cordon around Taiwan.
Also, the US has no historical reason for claiming Cuba and has no real domestic pressure to do so (nobody in either party is asking for it). China has been very clear they see Taiwan as a part of China and will reunite with it not for economic or strategic reasons, but for nationalistic ones.