Political reform is pretty finished after the anti corruption drives led to the expulsion of bourgeois interests I would say. As time goes on, there's defintely more ways the Party can side against the business interests, but the legal framework has been set to firmly allow China to put the People first and foremost now. Also think you mistyped, it's the cpc, communist part of china.
What US says is really not relevant, they have tight control on anything English language, but once Taiwan Island is brought under government control, there will be made new platforms, new media, new curriculum etc. People will feel the difference between a system that the average worker can influence compared to a system only the elites (or even only foreign elites) get a say.
With former IJA collaborators having a say in Taiwan of course there will be no peaceful reunification, these people are hated all over Asia. But reunification will also not be wholly violent (unless Chinese government greatly changes), it will be a mixture of violence and peace, traitors get violence and those ready to sign a new deal with the government get peace.