Honestly, what happened more than anything was the takeoff of smart watches, which do everything glass can without the being glasses. Glass isn't VR, in order to really succeed, it should have been, or will have to wait for the technology that exists in order for it to be.
We have had: Apple's creation of a watch Android wear Moto 360/others. For those who want a "fast platform for checking things" watches serve the purpose of glass a thousand times over, while being smaller, easier to use, and less stand-out. "taking off" doesn't mean everyone has heard about and is using them, "Taking off" just means that there are a lot more watches and development behind smart watches now than there was when google glass first started getting popular.
1) Don't lecture me. 2) No one has bought an Watch so discussing the market response is premature. 3) 30% of Galaxy Gears were returned. Which is pretty bad, 'cuz they only shipped 800,000 of them. Not sold, shipped. 4) there are 19,000 different android devices as of August 21. As of today, there are five Android Wear watches. If you want to define "taking off" as "available" I'm with you. If you want to define it as "selling in any way other than slow and stagnantly" I'm not. 800,000 "shipped" minus 250,000 returned isn't quite Amazon Fire Phone bad, but even Microsoft managed to sell 2 million Zunes and that device is regarded worldwide as a resounding failure. Again, "taking off" is hardly the phrase I'd use.
I'm not even going to bother to respond to "don't lecture me". I don't know what you mean by "market response", as smart watches have been being released and developed before the I-watch. The only big deal about the I-watch is that it promotes and brings the idea of a smartwatch to the public eye. The galaxy gear was absolute shit. Not only that, it only worked/works on high end samsung phones. It's failures are for reasons not related to it being a smartwatch. Comparing the number of current android devices released to the number of watches is like comparing modern cell phones to landlines in the 70's. Smart watches are an emerging/new sort of thing that is just starting to take off. The momentum building is exactly why apple decided to create the I-watch. Taking off, as stated before, is the idea that it is a new and recent technology that is just getting it's feet under it. The current smartwatches are like the early android/smart-touch phones. Kind of clunky, kind of big, and without too huge a number of features. As time passes people will get more used to it. And as a disclaimer, I have no excitement over the I-watch or android wear. The pebble has it right as to what smart-watches should be. Watch with extra features, not smartphone on wrist. The pebble, though, remains a smartwatch. Disclaimer: I own a pebble. Splurged fifty bucks on ebay. Worth every penny.