It's in my diary
About 4 years hence, just as Scratch is gaining real traction, is looking like a smart polished product, and has a dedicated but perhaps not quite critical mass user base, when Google gives 30 days notice that Scratch will be closed and users have 90 days to download their data or lose it.
I can't see any other end to this initiative unless they bundle it so that Apps developed with Scratch can only sling Ads from Google's Double Click...