Think about this for a moment. Suppose the locals do what you suggest. They run PSA's to inform viewers of the situation. Question: how do you think the electronics advertisers would react? I think they might raise and eyebrow or two.Why would they? this matter involves OTA transmissions not satellite broadcasts. Maybe OTA broadcasters could air spots explalining it to OTA viewers (who are the ones affected by it) but airing something on DISH or osting this in an area frequented by DISH Network subs is not the best way to get the message to those that need it.
BTW I think your idea is excellent. Just playing devil's advocate.