I'm not sure how much of a concern that is for most users, who use Google to get to all the content on the Internet anyway. Having DNS records wouldn't buy Google much that they don't already have from search queries and results.

It's getting to be a very rare (non-technical) user who actually types URLs directly into their browser; most people go through Google, even to get to sites where the domain name and site name are exactly the same. They're hitting Google for every single site they visit already.