Did an MBA in Hong Kong, just finished earlier this year. A lot of my classmates are mainland Chinese. Bunch of them would regularly talk with each other and say that military action was the only way to resolve the situation, China needs to send its military to Taiwan and overrun the Taiwanese defenses quickly. Baffles my mind that they're so ready to default to war.
Some other mainland Chinese people are more nuanced in their thoughts. I have no idea about population percentages for opinions. But this a world-class top 20 MBA school, and had one undergraduate student die while protesting (fell off a building). Bunch of these classmates are educated with masters degrees from American universities. If they default to war, I'm a bit concerned, I'd expect them to see more nuance in the world. For them, it's not really war of course, as Taiwan was always theirs in the first place in their eyes. Any foreign interference in the matter is a slap in the face of Chinese sovereignty, was the same for Hong Kong.
Hong Kong is a difficult situation because the entire world agrees that Hong Kong belongs to China. Taiwan is difficult in that most of the world has agreed that Taiwan belongs to China, that is the crux of the One China policy that China forces all countries to agree to if they want to have diplomatic and trade relations with China. If you break with the One China policy, you break diplomatic and trade relations with China. Don't see most countries willing to take that step. Big game of chicken.
For what it's worth, the Chinese government's official stance is that military action is a last resort option only if diplomatic negotiations fail.