Why does China want Taiwan? Most people miss the simple answer. It's because of Taiwan's fantastic high tech economy. China salivates at having all that economic power and foreign reserves under it's own rule. To have those high tech engineers to help do research and development on China's high tech war machine.
Taiwan is so powerful in the computer world as afar as chips, motherboards, laptops and more, that after invading/capturing Taiwan, China could possibly play favorites on who gets to buy the latest high tech toys from Taiwan. China will of course have first shot.
Oh yes...they want it badly. But the Taiwanese are used to freedom and will fight very hard. It is likely that a lot of the factories and many of the negineeres will be destroyed short of us coming to their assistance...which I believe we shall.