I'm not 100% sure I know what you're getting at, but I see it as accelerationsism leading to one of a spectrum of possibilities. On one end of the spectrum, you have a good, positive outcome, where shit went really bad but as a result, humanity somehow opened its eyes and saw the potential of what we could do and how we could live, and thus embraced socialism and then communism. But the other possibility is accelerationism just gets us all the quicker to a true hell, albeit non-Marxist/Hegelian, as it would be all contradiction all the time with no synthesis. Just abject despair for everyone and happy happy joy joy for the minuscule subset of the most sociopathic of sociopaths.

Edit: What comes after depends on where on that spectrum we end up. Doomerism is that it's all fucked. Do what you want, what does it matter? It's just boring old nihilism. Accepting death happens a lot of ways, countless ways. Accepting death, how or if that is done depends on culture and on the individual, I'd think. Maybe I misunderstood you though.