Probably never. The forcefield is more of a pipe dream then people realize. Currently it doesn't look promising for the Star Trek sci-fi forcefield to be a reality. Seeing how the holodeck as seen in the show is the product of holograms and forcefields, you seem to be out of luck on this one.zfactor said:The Holodeck.
Right now. It is basically the kinect with force feedback, so we can do it... Somehow...
Virtual reality however might be possible, and the more we learn about how the brain works the closer to reality it might become.
I think we need to pour everything the US has into more research of the aging process. We have had some very significant breakthroughs in animal testing recently, and I think it would a great way to flip the rest of the world the bird if we figured out how to basically halt the aging process and all lived for several centuries, while the rest of the world tried desperately to figure out how we did it. We could just say to each new generation "Ha, there you where thinking you where so superior, now who only gets to live for 70 or so years. You that's who."