I'm sorry, but your post looks a lot like FUD.
Why? Because they are things you didn't use?
Google Notebook? Some of us actually used that.
Google Video? Some of us used that too. Sure we could move to Youtube or Vimeo or 100 sites now. Point is Google Video ended.
Wave? Yeah, it was never huge, but I got a lot of people signed up and had quite a few good Waves.
Yes, I use/used Google Health. So what? Again I get burned.
There's more I never used. Dodgeball, Jaiku, Google Catalog Search, Mashup, Lively, Google Answers, etc that I never used, but just goes to show they are not afraid to move on. Which is probably good for them, just bad for me.