[opinion]
See: http://www.roughrock.k12.az.us/Welcome.htm
This does work rather well. However, there are few jobs on the reservation. Many young people leave, often because of non-Navajo spouses, and the kids never learn Navajo. They are on the tribal roles, but they are not active members. Plus, a Navajo who is not fluent in English has limited job prospects off the Rez. RR Demonstration recognizes that challenge pretty well. It is one school. There are many others: BIA, or Apache, Navajo, or Coconino county schools. Results are not heartening, IMO.
So, yes, people are trying. Are they all succeeding? IMO, probably not.
[/opinion]