John,
Regarding a couple of your posts: I will bet you twenty somethings of bitcoins Burning Tree survives. Second, and building on Jeff's point, I could see walking making a big comeback. Here's the scenario: you mention smoking. Some call sitting the new smoking and health insurance starts to punish those - wait, scratch that - starts to reward those who log a minimum number of steps per day or week, as recorded by a wearable device.