They could shut down the public facing product and make it internal only.

But why would they? The Google Docs suite is a billion+ user product, which is monetized through Google Workspace and Google for Education (with many millions of paid user subscriptions).

This is just not remotely plausible of a shutdown target. It also dates back to 2006. I'm struggling to think of even five Google products I would name as being less likely to be shut down.

...they killed some productivity apps. Don't say never. Hangouts, dead. Keep App, dead. Enterprise Search, dead. etc

Keep isn't dead. I use it everyday on my personal and business account. I love keep. I will be sad when the inevitably kill it though.

Keep is dead?

Hangouts functionality basically still exists, just under a different name. It's still integrated in Gmail, with the same contact list, and all the previous conversations from Hangouts were still there. It's so similar that I bet many people don't even realize anything changed.

This is unlike, say, Reader, which was canceled with no replacement to this day.