I've had DNSSEC validation enabled for years and Google's services never broke for me. I don't think the problem lies with Google on this one, it's probably a bug in your resolver (or worse, your ISP may be intercepting DNS traffic to Google).
Google doesn't use DNSSEC, unfortunately, so this shouldn't be a problem. If your resolver breaks on this, I think that may be the result of a bug or misconfiguration, because there's no DNSSEC to validate here.
The argument that absolutely nothing that the world relies on, is not being singed (google Facebook reddit Cisco MicroSoft etc) holds no clout with the believers, unfortunately.