It seems like it could potentially really enable massive reuse of older, slower laptops that might otherwise be thrown away.
It seems to me like handling driver support would be the hard part. Is that their special sauce?
I can't see this as anything but a clear win for the environment and for education. And unlike the "Google shuts down everything" meme, this seems so obviously massively helpful to their entire ChromeOS strategy it looks like it'll be here to stay.