Has Google ever "sunset" a product they actually charge money for? That might help us understand what they'd do in this case. But I don't think there's a lot of precedent there.
This does seem entirely like a whimsical side project for Google. If you want a reliable domain registrar, find one that doesn't do anything else.
They're in the domain business now, and I don't think they're going to drop out any time soon.
Seems pretty logical to me considering they have a very popular email and cloud business that requires you to have a domain.
http://socialmediatoday.com/jordanv/2264086/google-sunsets-w...