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I watched this happen in a research institution in the early 2000s. Scientists who had been heavy SGI, Sun, or HP customers realized that they could get a lot more bang for their buck with beige-box PCs running Linux (or occasionally FreeBSD). Aside from up-front costs, hardware upgrades and replacements were much cheaper and easier to get for PCs.
The big Unix vendors did not help their reputation when they started selling Windows machines — which all of them except Sun did in that era. It became increasingly clear that commercial Unix for scientific computing no longer had a future.
They’re called Macs, iPhones, and iPads.
macOS has been UNIX certified since 2001. NeXTSTEP, what Mac OS X and macOS is based on, was UNIX certified from 1986-1997 or so until development stopped.
iOS, iPadOS, watchOS, tvOS, CarPlay… they are all UNIX.
UNIX workstations didn’t go away, they just got very pretty.
