I’m not so sure about that. Modern societies seem to be trending towards more democracy rather then the opposite. There are a few notable exceptions (including the USA). But I would argue they are notable because they are rare. Today’s authoritarian regimes seem far more unstable then today’s democracies. Dictatorships and authoritarian regimes are falling to a coup, popular uprisings or legislative democratic reforms, all the time (notable examples include South Korea, Taiwan, South Africa and Argentina). Even today’s most prominent authoritarian regimes in mainland China and Cuba are enacting more and more democratic reforms (albeit very limited in the former case).

But then again, I’m not a historian. So this is just some guys on the internet’s interpretation.