With a little bit of careful adjustment to settings, you can disable all Google services on a Nexus device. It takes a little effort, but it can be done - unrooted and unmodified.
interesting. I'm aware that to quell anticompetitive accusations, google allows removal of many google apps and disabling of many services. But I believe the Google Play Services is deeply embedded in the google stock rom such that it can't be safely disabled in entirety.