I initially agreed. It really depends on how this purported shape-from-shading-due-to-eye-flickering thing works. I don't at all understand danah's claims about how eye flickering gives you extra data, and my first-principles impulse is to say it sounds implausible to me... but supposing she's right, depending on what she means, maybe eye trackers would be required to produce proper depth cues. In which case it's a hardware problem too (though of course the game engines would also be required to support it, blah blah).