For those wondering, the 6502 and various derivatives are still being manufactured, by one of its original creators [0] - so I'd guess an equivalent development in the world of the Z80's nemesis is unlikely anytime soon.
https://hackaday.com/2024/04/19/end-of-life-for-z80-cpu-and-...
https://en.wikipedia.org/wiki/Zilog_eZ80#Use_in_commercial_p...
https://arstechnica.com/gadgets/2024/04/after-48-years-zilog...
https://en.wikipedia.org/wiki/Zilog_eZ80
There must be millions floating out there. But with distributors like Mouser or Farnell gone, for anyone looking to buy some, it's eBay & co which tends to be a crapshoot.
Not the past decade, but two decades ago (2005) the z80 was still popular. At work, I was working on a product based on, IIRC, a Rabbit Semiconductor product, which was a module with on-chip ethernet. It was a Z80 running at 40Mhz.
Personally, I also had a little siemens organiser thing, that also was z80 based (not sure of the actual specs). I recall trying to write programs for it and failing (may not have been open; no way to reprogram or download new code to it, maybe).
[EDIT: The organiser was a siemens IC35]