The centennial accord has a disclosure at the end that seems to leave the option of going back to the FAB possible.
"Each of the parties respects the sovereignty of each other party. In executing this Accord, no party waives any rights, including treaty rights, immunities, including sovereign immunities, or jurisdiction. Neither does this Accord diminish any rights or protections afforded other Indian persons or entities under state or federal law. Through this Accord parties strengthen their collective ability to successfully resolve issues of mutual concern.
While the relationship described by this Accord provides increased ability to solve problems, it likely will not result in a resolution of all issues. Therefore, inherent in their relationship is the right of each of the parties to elevate an issue of importance to any decision-making authority of another party, including, where appropriate, that party's executive office."

I believe we just need to call the states bluff when they say there is nothing they can do and point out that they are lying and are just opting not to do anything.