There are some interesting ways this technology could be used, and while I don't imagine it's going to be a big deal that will revolutionise the way games are made in the future, it might get rid of some of the annoyances of being a console gamer.
But the problem is that any game that uses Smart Glass would only be able to use it as an optional feature. Many people playing won't have tablets or even smartphones to use, so games will never be able to take full advantage of having two screens. I'd rather not have to pull out my smartphone and connect it to my 360 just to have an alternate way to manage my inventory.
Now, if developers knew that 100% of their userbase would have a tablet to use with the game, such as with Nintendo's Wii U controller, then I can imagine some interesting uses for it.