3D will certainly allow the market to feel as though they're being penetrated.

How bad would things have to be on Earth (notwithstanding my neighbors and their damn barking dog) before it would be preferable to live in a pressurized cavern on the moon?

"Yep, Uncle John was in terrible shape, what with his Alzheimer's and epilepsy and what not. But those doctors smeared some of his brain cells on that robot, and now he's just rolling around like crazy!"