Interesting food for thought.
The walking thing is really interesting. My home course is certainly walkable, but there is many a day where there are no walkers. The remaining walkers are all for the most part very fit and health oriented 60-70 year olds. When I play, I prefer to walk, but if the group I am with wants to ride, I ride, because otherwise it just seems to make the whole rhythm of the group awkward. Because there are some very long walks between a few holes, my club is a residential course, and it does not make you real popular when the rest are waiting for 5-7 minutes.
There are times when I suggest walking and I see utter horror upon the faces of others. It is a change in mindset. When I started the game, riding was the exception. The clubs had a few carts, but not a whole fleet. Because most courses were walkable, they were designed as such, the topography was right and the needs of a residential development did not come first. Now walking is viewed as the exception, courses have entire fleets of golf carts. If you are a walker you are viewed as a kind of freak. I regularly hear comments as "Look at those dumb walkers out there". I know there are still many clubs out there where there is a culture of walking, I am envious of those clubs and wonder if that culture will exist 25 years from now.
We are becoming increasingly sedentary. A lot of the young people spend of time doing electronic based pastimes that do not encourage fitness and exertion. That is a whole different issue, it has been discussed enough. The golf course of the future, will it have some kind of conveyer system, where you stand on the cart path and it moves. Sounds silly, but what will the golf course of the future be like? Makes for some interesting speculation and conversation.