Some of the tribes are ready to take over all of the duties and have been doing a lot of it for a while. But, other tribes have not and are going to need to get help and training from the Federal Government because they still must comply with Federal laws and federal civil rights governing  child protection. Some tribes are just too small but what they may do is join in with other tribes to form coalitions where they can help each other provide the services needed. 
A month of so ago, didn't some of the tribes do something where they formed a collective agreement?