Geoffrey,
Easy answer to your second question: Computer Simulations.
The reason we don't use them now is that they aren't good enough. But they'll get better.
I can easily see the day where we can get courses to look photorealistic (like watching a movie), most importantly with easy-to-use functions. Plug in the CAD data, click the mouse a couple 'o times, and voilą, Virtual Reality Presentation, complete with those hi-tech VR goggles.