3D will grow, but I feel it will not grow as fast as it rightfully should due to the lack of manufacturer's advertising budget with promoting this form of entertainment. As time goes on, more flat panel sets are being replaced (as funds allow), and even "medium" price range sets are now coming with 3D and internet connectivity.... that's "old" stuff. The newest stuff (and the expensive stuff) is all about 4K... and every 4K set also includes 3D and internet connectivity. Remember 3D is an option, and with Avatar/Promethius/Hugo/Gravity type films available, more will eventually take the plunge to see if it works in their own home.
(Caveat to this... with minimal expense as possible. Many won't rush out to "double dip" something like Avatar which they probably have in their library already, but a new release like Gravity, or Hobbit might entice some to give it a shot and check out what their recently purchased flat panel can do. And the farther into the future you go, the greater number of 3D sets will be in consumers homes, and the larger the quality offerings will be to check out.)
Not even close to dead, not needing life support... but definetely not "thriving" either. Eventually it will be more "mainstream", presuming the conversions remain high caliber (Titanic/Wizard of Oz) and the native shot are planned & directed correctly (Avatar/Hugo/Promethius)
Anyways, I'll sit back and enjoy my home 3D experiences, regardless what others/many/most believe/hope/wish.