i am sorry that you have not yet reached that time in your life when getting around is not as easy as it used to be. may you enjoy it when the time comes. come back and report at that time.
there is a time in a person's life when they hesitate to use a wheel chair or other mechanical means of transportation. first because they are not really disabled yet and because that does get in the way of other other park visitors, and they don't want to take that place away from people who are truly disabled. second, because they can still get around without total assistance and prefer it that way. and the key word there is total. a moving sidewalk is just a small amount of assistance that could help those people who are suffering from the effects of old age and other conditions that make it a little more difficult to get around.
whether you have anyone in your life that you care enough about to want them to also have the disney experience or not, some of us do.
and i still think it would be a great way to have a safari thru the outer edges of the ak park.