The treaties were made in perpetuity, and if you are going to not hold up the crown's end of the promises, the FN's side - giving the crown and Alberta governance over the land - needs to be reverted as well.
Contracts require both sides to adhere to them.
That is wrong. You were probably thinking of British Columbia, where no such grand Treaties were ever enacted.
do you actually know what the terms are, and who has what responsibility to them?