I think that everyone needs to realize that glass is glass.
If they made something different, that wasn't glass, then they would create a new name for it. Believe me, with all the innovation that Apple likes to do, I don't think they'd have any reason to not want to make a new invention.
However, as long as they call it glass, no matter what adjective they give it...gorilla, unbreakable, impenetrable, etc., as long as they call it "glass", it will always have the characteristics of glass, and thus, is susceptible to cracking. RECOGNIZE and RESPECT.
http://en.wikipedia.org/wiki/Glass