Conservatism will never die.
Social progressivism and social conservatism are always evolving.
This is the key point. No one was talking about gay marriage when divorce was deregulated. Who knows what social issue will appall today's social liberals in 2040.
If this is all based on the idea that Millennials are near-universally liberal on social issues, I'd guess it'll be something about trigger warnings and trans issues.
It'll be transhumanism I suspect.
The thing about transhumanism is that while one position on it is pretty clearly more 'liberal' than others, pretty much any position could be construed to be the 'leftist' one depending on how pessimistic you are about people's capacity to just use it to reinforce preexisting power structures and how closely you link it conceptually to things like the Californian Ideology and even neo-eugenics. I, as it happens, am pretty damn pessimistic about all of those things. 'Techno-progressivism' isn't.
