Then they invented airbags and made seat-belts mandatory and stopped our pesky faces from ever getting near our windshields. Now the bigger concern is for the people getting hit by cars, again the same issue arises that the 60s had where the glass will be too strong and not provide enough energy absorption. But I don't think there's any regulation for that yet.
I see this being first used in S Class Mercedes and other manufacturers will follow in years to come.
I don't know if there's regulation for pedestrian safety, but there is a star rating! Guess pedestrians walk off curbs with some regularity oblivious to their surroundings. And the star rating measures how comfortable the crash is to their little plugged-in, jacked-up, non-thinking heads.
www.fiafoundation.org/news/archive/2005/Pages/EuroNCAPannouncesfirstfour-starratingforpedestrianprotection.aspx
I couldn't find similar tests for North America. But they're so lawsuit happy there, they probably want to harden the glass to the point where it bounces the pedestrian into a chain reaction event taking out their next of kin until there's nobody left to sue the driver. (joking)
I was watching the Gorilla Glass 3 demo at Youtube.com where the heavy steel ball bounces off the new Gorilla Glass, thinking that will bounce a head or two off the glass with some energy.