I'm not worried about a shutdown as much as I am worried about it going into maintenance mode like Google Voice.
I think about the Flip Video -- a reasonably-priced, small video recorder that could capture up to 2 hours of HD video. It was purchased by Cisco in 2009, and the product line was killed 23 months later. This was before a large number of consumers had quality smartphone cameras.
Google had a good reason to drop $3.2B on Nest. Providing useful products that consumers love is not it.