Is there any good fiction or movie about a slow, completely foreseeable apocalypse, unfolding over say 50 years? Everything I can think of seems to imagine a sharp cliff over days or weeks, but decades is what seems likely.
's The Peripheral, where the slow-moving apocalypse, labelled the Jackpot, sees 80% of the population dying off over a ~40 year period, leaving behind only the rich and the lucky.
No. At least, the first two volumes of the trilogy are about the ramp-up to the apex, and in the later (>70 years on) time frame, how society has adjusted to the new reality. The third volume will probably launch next year. Assuming things haven't fallen apart by then.