Plenty of people out there are already using Google Search, Chrome, GMail, Hangouts, Google+, YouTube, Google DNS, Android and more. I can't imagine what additional information you'd risk exposing by using their Internet service as well. I suspect maybe they would be collecting data regarding your TV viewing habits as a result of this. After some thought, I think that I would welcome that collection of data if it were put to use. I have a hard time believing the accuracy of Nielsen ratings based on their results, or has taste in this country declined that precipitously?
At the end of the day, I think its in Google's own interest that more people have fast as possible internet. The more bandwidth available, the more its users consume its products. In this case, its a win-win scenario.