This is a pretty silly statement, because it implies that what someone could do with google glass they don't normally already do. What about a TomTom? Is that illegal? Is it better to look at its screen wherever you positioned it in the car? What about billboards? Aren't they there to catch your attention while driving? Are they illegal? What about checking your speedometer or the gas level, or gas mileage?

In the future things like google glass or even active screens/windshields will be more and more able to show the same information and more, without necessarily implying any unsafe behavior on the road.