People ask me all the time if Google will pull the plug on Glass.
No, they won't. Ever. Well, at least not until they develop contact lens computers.
Here's the right way to think about Glass's viability: Is Glass a G+ or a Wave?
G+ is a company wide endeavor. G+ has been integrated into literally everything Google does - search, maps, Gmail, Android, Chrome, etc. It's a layer that lives across the Google-verse.
Does Plus make any money? No. Will it ever make money? No.
Does Google embark on lots of ridiculous projects that will never make a significant sum of money or inflate margins? Yes. See:
Gmail
Maps
Youtube
Android
Chrome
Fiber
In retrospect with 20-20 vision, would you kill any of these businesses because they aren't "profitable" in the traditional sense of the word? No. That would be stupid. All of these businesses are strategically valuable to Google.
Now let's consider some failed projects, such as Wave and Buzz. Both of these were isolated projects that never had any scope within the Google-verse. They were silted. And they never really had a defined use case. They most certainly weren't very ambitious, at least not relative to the projects listed above.
Now let's consider Glass:
1) most Google engineers are sporting Glass
2) Google ran the largest social media campaign ever, #ifihadglass
3) Google forked Android
4) Google "graduated" Glass from Google X into a free standing Glass division
5) Google invested in Glass's screen manufacturer
6) Google wants the concept of eyeware computing to exist, at any cost (data mining galore)
7) Google has the bank roll and the grit to do ridiculous things, hence Google X
8) Google isn't going to let Apple pioneer the next form factor revolution. Apple led the last two, smartphones and tablets, because no one else was structured to: creating new form factors without hardware and software teams is impossible. Google has figured this out, and Glass is a response.
Making any claim that Glass won't come to market is absolutely ludicrous. Glass is one of the most strategically important projects at Google.