3D in todays format is a no go dead technology. Everyone knew it was bad, everyone knew it was way too early, considering how many nations have not even partially switched to SD digital TV, not to mention something that would make sense as 3D conversion.
It's niche specific novelty, it's like 3D QSound in nineties for audiophiles. Just that this time it's the "nutter film buff" and "avid gamer" market. Everyone knew this tech is bad, because every single one of them already failed to lift this tech off the ground once. Even gaming world and Nvidia has already been through adventures with 3D - most of us can still remember Elsa Revelator 3D glasses as shipped with TNT cards in deep nineties.
Because it's the heavy money and large studios that push this tech this time around, it will probably float around for a while. 3-5 years + before satellite channels will start withdrawing 3D channels and studios stop decimating blu ray movies with horrible 3D conversions. Big titles - another Avatar type of movie, might delay it. But otherwise, 5 years max. It will eventually fail for the same reason as before. First to go will be active tech - it will probably take couple of people with slightly malfunctioning glasses in energy saving fluorescent bulb lit room to go down in epileptic fit with foam on their mouth before some US senator calls for strict regulations of this technology, at which point active 3D tech manufacturers agree there is no way to make it safe or in fact - even headache free and will call it quits.
The passive 3D tech will be around for longer. But eventually people will simply get sick of sitting in their living rooms in stupid glasses (often on top of their real glasses) and even sicker of watching ugly gray anaglyphs when without. Glasses will eventually end up like everything else in "home cinema" novelty world. In the attic, together with rear speakers that had to be cabled across busy traffic path to the kitchen to the utmost fury of your wife and subwoofer that made neighbours downstairs punch a hole in their ceiling with mop handle every time you tried to emerge in Dolby labeled sonic experience.
At the end of the day - it just wasn't worth it. Our lifestyles and cribs are seldom made for conversions to cinema. Most of us don't watch our films with 5.1 turned to cinema levels, we don't watch them in the dark, we don't watch them exclusively, we don't watch them start to end without at least one member of family running around and asking "what happened, who's this guy" every five minutes. And this is where all of those "cinema" gadgets ultimately fail in home environment. It's a niche of teen to twenty something males, who share their rooms and flats with other males, and then quickly grow up to discover the only way they are ever going to get that "one to one" cinema at home with wife and kids, is with laptop, in bed, or on the train, with headphones on. Usually in several "I fell asleep somewhere around this scene" episodes. If you had time for cinema experience you'd be watching it in cinema. You don't have time. And you won't have time for this. It's not a lifestyle that will ever be friendly to sitting in front of unsharp TV with battery powered glasses on your face.
Home 3D can only take off when it doesn't involve glasses. End of. There is no point of arguing this.