the reason former Hasids appear on TV is because its a better story than MO leaving.
The reality is MO people are not particulary interesting to TV. They dont look or act different that other people, they talk, work and dress like everyone else. They are not mysterious.
Hasids are more mysterious between their dress, look , speech actions etc are much more different and make great TV.
Its likely most people have met a MO person, but very few have ever met or spoken to a Chasid and riding the subway or shopping at B & H doesnt really count.
Anybody who is different is who they want. They want people like Amish as well because they are so different.