1. DISH does not want to provide Distants even for RV's. Nothing else matters beyond that.
2. Comparing Superstations to Distants makes no sense, to begin with they are in SD only. (One can be seen in HD only if you are in the spotbeam of the local HD version) But even at that, Superstations are no longer offered unless grandfathered because DISH will likely be ending those at sometime too.
3. DISH is making plans to end duplication because more bandwidth is needed for sports and other HD offerings. It appears some locals will only be on one ARC that are presently on two. The last thing DISH wants to do is use bandwidth for HD Distants, that for all purposes only RV's are allowed to get anyway.
4. KyL416 covered the Canadian law well, simply it is more restrictive not less.
5. AAD did not and could not give everyone DISTANTS, it is against the law and they would have been shut down. You had to at least give them a service address that qualified for some or all networks. The only way it works is an AAD situation where the carrier does not provide your locals. KyL416 also covered that well.
If someone wants a different set of locals there are ways of doing it. There are at least two online sites that provide the four networks, one from NY the other from Pittsburgh I think. I get a very good picture watching the Tampa locals when I am in Ct using my slingbox that gets OTA, no Cable/Satellite is even needed. If you really want a specific set of locals that you want to watch often, find someone to let you set up a slingbox.