Comment by pfranz

It was rumored for like a decade. The last 32-bit computers were sold in something like 2007-2008? High Sierra started throwing warnings when you launched 32-bit apps. In 2018, they announced Mojave would be the last version to support them. Mojave just got an update yesterday and will likely get updates for at least another year. So nobody has been forced out yet.

I'm aware end users with discontinued software were forced into some no-win choices. But as an ecosystem, it's one example where this happened and was given a ~15 year possible window and an explicit 4 year window to transition.