I would like to chime in with the previous guy.
There is a huge market in hospitals for people who have lost their ability to move arms to use computers. I am currently working on such a case and would love to give the incapacitated people a chance to surf the web again. At the moment they can only watch the TV or listen to the radio and not even change the channels unless a nurse helps them out…
Please. This feature would mean so much more for so many people than gaming where eye control is less valuable feature. The most important area in gaming for eye tracking will be in VR where Tobii kind of tech is not usable.
Source: I am a game developer.