"However, widespread facial and eye tracking might not be something that the public is going to eagerly embrace."

lol hahaha clearly you've never met the public. Have you ever read any of the comments on your own articles? Of course the majority of people will eagerly embrace emotion and eye tracking, they're already embracing facial recognition (you express emotions on your face so you only need minor software tweeks to turn facial recognition into emotion reading) just to get through lines at the airport faster and so the government can keep everyone safe from all the explode-y terrorists, sneaky Muslims, dastardly Russians, and all the other boogiemen hiding everywhere that can only be detected by massive data retention and facial recognition that clearly identifies every and only the bad guys and would never be used to track anyone else (certainly not activists, protestors, veterans, or anyone that would dare to question the government).

An electronic prison that will destroy any notion of privacy and freedom is being built around all of us and people are not only welcoming it but practically begging for it in the name of convenience and the illusion of safety. Most people are either unaware or don't seem to care about the massive data collection of every electronic communication you send (email, text, websites, video, etc, which includes all them naughty pictures you send), plus number plate readers (that track everywhere you go by vehicle), the use of digital currency (just tap your card/phone) where every digital transaction can be tracked, and with facial recognition software being installed that can be applied to most CCTV cameras scattered everywhere that can not only track any individual from point A to point Z (if you've got a drivers license or passport you'll be automatically added to the system and if there are cameras you can be tracked from the moment you walk out your front door and everywhere you go until you get back home) but as mentioned above with only minor tweeks you can easily add emotion reading into facial recognition software.

But yay we can get through a line faster.