5 years from now we'll have holographic displays. 20 years from now it will be only direct neural interface. You will still be able to convert your old BD3Ds, or pay $500 for an original upscaled/sensory-augmented cloud copy.
Of course, if the revolution does not happen before that.
Netflix finally opened up 3D and with a pretty decent selection.
3D is not dying... it's just never going to really take off like color did. At best it will just become ubiquitous and normal.
That said I just saw Gravity in 3D and while it wasn't bad it was not one of the best uses of 3D I have seen by a long shot. If that can draw 3D crowds it's just a matter of getting people on board over time.
I have your dream TV now an LG 4K 84" which I would not have bought if 3D was going to be dead. Look at all the new 3D movies lately, Gravity set a new record with 80% watching in 3D.
Sound and Vision reviews this TV in their latest issue. The thing they were most impressed with was the 3D, which they rave is the best they've ever seen anywhere, including at IMAX 3D theaters (except for the huge IMAX screen size, of course). 3D isn't dead. It's just on vacation until the industry gets back around to it after James Cameron's Avatar sequel takes in 3 billion dollars. Sadly, CE types have ADD, and we have to suffer through the latest predictable attack.
Virtual Reality was also dead once upon a time. If you aren't living under a rock you probably have heard about the Oculus Rift. Suddenly VR is back from the grave. Sometimes technology just needs to advance a little to raise the dead. 3D has been around forever despite being labeled as dead every time it gets popular. 3D will only get better in the future. Once the glasses free barrier is perfected 3D will be the rage all over again... despite the naysayers of the future claiming it is just a gimmick and a fad.