Instead, I think postcyerpunk should be updating the cyberpunk genre to reflect current modern societal fears. Cyberpunk was very much a product of the 1980s. The societal fears in the US revolved around rising crime rates, unchecked capitalism, Japan's rise in influence, etc. Blade Runner perfectly encapsulates all of that. But today, 40 years later, the societal fears have changed. Personally, I think the movie Elysium is the best example of postcyberpunk. It's still about high-tech low-lifes except the societal fears have been changed to climate change, the wealth gap, and free access to healthcare.
This definitely makes more sense, and sounds more interesting to me. I totally agree with you on what postcyberpunk is/should be.
Although, I don't think either climate change nor other current concerns like the rise of right wing populism and fascism are new to the cyberpunk genre — see for instance John Shirley's cyberpunk trilogy A Song Called Youth or the settings of Hardwired and Cyberpunk 2020. And the other new concerns you list are just epiphenomena of capitalism's dominance of our society.
Relatedly, I do think, though, that our picture of what unchecked capitalism does and will look like in the future has changed since the 80s. Instead of corporations absent a government, or acting as broken up, haphazard governments, what we are actually seeing is a corporate-state merger, corporations taking over the state and turning it to their own ends — primarily the enforcement of property and destruction of worker power — because it's much more profitable to use an apparatus that's funded (via taxes) by the very people you want to defend yourself from and extract profit from, and already has a vineer of legitimacy, instead of having to do it all yourself. The ultimate form of outsourcing.
I see that as a misunderstanding of the genre. One of cyberpunk's major influences was the hard-boiled detective/film-noir stories where the main character gets heavily involved in a case but their life isn't personally improved after resolving it
That's true. One of the things that I wish cyberpunk would explore more actually is the idea of actually fighting back against the system, or trying to build and defend what small positive things you can in the interstices between the megacorporations, and the process of doing those things in spite of knowing that, ultimately, you are doomed to fail — the system is far bigger than you, and nothing you or even a small group of people can do will ever really make a difference in the long run. Finding reasons to go on and keep fighting despite having no illusions that there is any hope. This is essential to why I liked Hardwired and Cyberpunk: Edgerunners and yet it is surprisingly rare among cyberpunk works. Perhaps a move in this direction would indeed by post cyberpunk?
I've heard very good things about Ken MacLeod's work from figures I respect and whose opinions I relatively trust (including Ian M. Banks on the writing side and Kevin Carson on the anarchist side of things ;D)