Being one of the RVers affected by this, this is my assessment. While there are a fair number of full-timer RVers, not all use satellite TV, of those there is a divide between Dish and DirecTV,, and of those some were already using the "change service address" procedure because they didn't move very often.
I move about 40 times a year and relied on the channel consistency of DNS to keep my timers working. Since a lot of my timers were broadcast channels, the Hopper solved that problem.
I can see why AAD or any outer outside company cold not make a profit renting transponders and providing service to a reducing number of subscribers. However Dish is in a different position. As previously noted, Dish already has CONUS NY/LA channels so there is no additional transponder cost to Dish. There us the administration costs (certification, billing) which should be a break even if it could be charged for. But DNS is not an extra as it would replace Locals for a net even subscription price. (Can't have DNS and Locals).
Unlike a house resident, I have close to $2000 is equipment to receive Dish that doesn't work with DirectTV, so changing services is nit a whim decision. So life will change as I have to change my service address each time I move.
I found it interesting in this thread that so many responders were not RVers or truckers and DNS was not applicable to them. I guess the executive from Dish was correct, they are spending so much resources on "movers," which are challenged by the broadcasters, that there just wasn't enough resources for DNS service.