If you are referring to Revolv, Nest/Revolv stopped selling the device the day Nest acquired them (Oct 2014), and they are also issuing refunds to anyone that contacts them[0]. The other major hardware cancel I know about was the Nexus Q which Google also provided a full refund for anyone that contacts them.
Sure, Google could cancel it, but they seem to only do that with something if it was a total flop, and they then do what they can to fully refund whoever was effected.
That's an image thing, and I'm sure you can come up with all kinds of historical facts on why that image is not right, or not right anymore, but that hardly helps fix the image.
I think that if Google really wanted to fix that image, they could do revolutionary stuff like promise long term support, or publish a phone number.
EDIT! westernmostcoy pointed out that actually they do, clearly, publish a phone number, which is pretty decent of them. I got the HN points anyway so it's too late now, but still, good to see! Maybe I should read a site before I criticize it.
The examples of refunds provided for Neus Q and Revolv are a good example of the company trying to do what's right, and I'm sure that helps the image a little bit.
Plus at least for the onHub they do provide email and phone support. https://support.google.com/onhub/answer/6270180
Bottom right: https://on.google.com/hub/support/#ready "Contact Us" on: https://support.google.com/onhub#topic=6243113
I think the best possible outcome would involve them leaving the existing functionality intact.
Too many ways for this Google gadget to be made a brick because they don't care about their customers.