I mean sure but on that perspective native communities already have small numbers, this scenario is figuratively and literally brute forcing it although I guess that's kinda the point, but personally I think the scenario I showed is a more realistic approach to it given natives could only put up so much resistance even if they were given 0 land over some, especially because it's not like European settlers would immediately flock to whatever land is available, the process would still be gradual, afterall there is a reason why all of Oklahoma was initially given to the Amerindians, the government didn't have the hindsight to think the settlers would eventually go even after that land.