3D may not be being adopted has quickly as TV manufactures would like, but I don't think it is going away. This isn't the same once every decade or so gimmick it was. But the camel's nose under the tent won't be movies I think, but rather immersive 3D games with good 3D tracking.
I haven't yet tried Sony's Move system, but couple 3D tracking with a large 3D display and you may have an unbeatable gaming experience. I am also not a Second Lifer or a WoW player, but again 3D seems ideal for when you are not just looking passively at a story being told, but must move about in an environment. 3D Desktops have been predicted for quite sometime, but perhaps you really need true 3D to pull of a 3D Desktop.
Still this may all fall to wayside if someone can get rid of the screen, giving you true mobility in a 3D space. Yes there are VR 3D headsets, but they are clunker than the 3D glasses everyone here is already complaining about and high definition VR headsets are prohibitively expensive. No doubt technology will eventually catch up with how to make a high definition, light weight, untethered, long battery life, unobtrusive, VR headset.
On a related note, more than 3D for passive content, we need higher frame rates. There seems to be some conception that movies must be in 24fps to have a 'movie' feel as opposed to a 'TV' feel. I don't know any TV in full progressive 60fps. Most prime time TV shows are shot on 24fps film. 60fps 1080p would be much more immersive for high motion scenes. Someone needs to shoot some action epic in 60fps or higher and see if the public responds to it. IMAX once sometime ago shot one or two films in 48fps. It was insanely expensive to pull off back then, but now should be a cinch. Oddly almost every one's HDTV is capable of displaying 60fps, but unless you are using it for gaming it probably never use more than half this bandwidth.
(BTW, yes I posted this first in the wrong thread. Sigh....)