First and foremost, Bill C-53 is not about benefits. It is about the internal governance of these Métis governments.
Citizens have the opportunity to choose who represents them and who delivers programs and services to them. If an individual is satisfied with the governmental structure of the federal government and the provincial government that currently represent them, and they choose not to register as a Métis citizen of Saskatchewan, that is their choice.
If they choose to be represented by the Métis Nation-Saskatchewan, again, that is their choice.