HmongKnight has the best and probably most accurate explanation of "why our Hmong culture/rituals/traditions are dying..." It's really that simple people, kids grow up, go away for college, get jobs in a different state, get married and come 25 don't remember what it's like to have a shaman ceremony......
true story, if you were to tell me I'd have to host a shaman party, I'd cry.
No need for all these fancy explanations because we all know in our hearts why our culture is dying....