I am wondering why you think that Google technologies will never be adopted. From what I have seen of the industry there is a good chance they will be adopted.
Google also does not have to sell cars to consumers, it could modify cars to sell a service.
They may just buy Uber (they are a big investor) and run their own fleet.. Lets not forget Google also has Google Shopping Express and their mapping cars.. making those self driving could be a huge thing for Google. Example: Shopping express car drives up, opens a compartment you retrieve your box and it drives off. Uber drives up you get in, it brings you to your destination you get out, no driver required.
Google also does not have to sell cars to consumers, it could modify cars to sell a service.