More than likely all of these (natal, motion controls, 3D, head-tracking) are all leading to one thing... virtual reality. All of them are integral parts of something when combined would be working towards a complete virtual reality experience. Although tried way back in the 90s it was clear the tech wasn't ready.
But I think we are getting closer to where soon this might be the experience we get in the next couple of decades. And maybe not everyone would want virtual reality, but I think not only being able to see the experience first hand, but actually interact in it first hand would be the ultimate experience. Or, for 3rd person games, feeling like you are right there.
Guess that's just my opinion of where all this is going, but we'll see. I don't think classic gaming will die off, but this would be quite an advancement.
