I'm the author of the article :) while you're right that Libby is uniquely positioned, I see this attitude often in places like Geauga County, Ohio, for example, where I have many relatives. Just 2 weeks ago an Amish girl there, who's traditional, surrounded by other Amish, tole me she hardly speaks it at all anymore, even with her family at home! That area also doesn't represent the majority, but in areas besides Libby, it's increasingly common to use it more, among young people / with friends especially, but obviously it extends even further for her. She didn't really have an explanation but said she just doesn't even think about it and essentially prefers English. There isn't always overt negativity, but dismissal or apathy are very common.