I can agree in some points.
Still 3D will stay for long.
I dont know if it will be in the background or in the foreground.
i tried the Shutter glasses from Elsa years ago, and i got a headache quickly because of the flicker.
Now with my Zalman i do not get any headache in many Games (this is somehow gamedependend, maybe how they made the Field of View in the Game)
and how i set the 3D settings.
My only problem is the heat-problem. when i enable the 3D mode and have my second screen enabled, i can only play ~1 hour until i get white noise on screen.
And head-tracking is something completely different but still i think nice in 3D flight and racing games.
i can not think that this is nice in a 3D Ego-shooter where you can not move your head differently than your weapon or where you go.