China blew a great opportunity during the confrontations in Hong Kong.
Taiwanese are overwhelming (98%) descended from Han Chinese who immigrated from the mainland generations ago. Even though Taiwan has a liberal, multi-party political system and a vibrant economy, most of the world (including the United States) do not recognize it as a separate country.
China could hardly give in to the pro-democracy demonstrators in Hong Kong because that would incite hopes elsewhere in China proper, but they didn’t help their image in Taiwan.
Peaceful reunification was always a long shot. Recent events in Hong Kong make it longer.