Chinese are not hardcore people like Slavs. Their generals will refuse order once the bodybags start coming. The same thing happened during the last 2 years, PLA western command head got switched twice in like one year time.
Why they won't ? They have pledged to support Taiwan in case of Chinese invasion, again and again.
Second, even if we leave talks, Taiwan being snatched by China while America stands watching will establish China as the new superpower, especially in the whole of South East Asia. If Taiwan falls, the natural dominos after it will be the Philippines and Japan (or parts of it).
With the fall of Taiwan, America loses the whole semiconductor market, which means China will be unlimited veto power over any nation that needs semiconductors (which is like, every nation). The stakes are just too high.