I think there's a difference between cancelled (or renamed in the case of Google Home and Nexus) product lines and something no longer working. Most of that list falls into the former, but otherwise probably work fine.

This Googlebook will probably be a lot like the Pixelbook. Probably cancelled after 1 generation, but still usable for 5-10 years as you'd expect from a laptop.

My chromecast audio still works great. No idea about the rest, but that I do know.

The list of departed google products could be put to the music of the names of the countries of the world.

I don't have most of those, but from the entire list I only recognise Stadia as something that stopped working entirely, and I got my full purchase price back for that.

Chromecast still works great.

They refunded me all the money I spent on the Stadia + games and unlocked the video game controllers so I can use them with other systems... my only regret is that I didn't buy more

My chromecast audio still works great.