I'm not so much worried about authoritarianism as about the problem if a significant block of disaffection is not derived from "things are bad and they have to get better" as by either "things used to be better and I want to hang onto them" or "things are bad and I just want to burn things down".

Even an optimistic view of the future is fairly dependent on "soon a government is going to have to take the bit between its teeth and act on climate issues even if it upsets a lot of people", which looks a good deal like authoritarianism even if it has no dominant single leader.