she speaks the 'struth
Well, that's pretty much the argument the Indians have made about Manhattan. It is reasonable to say "no more." It is not reasonable to try to go back and return all land to its original owners. (1) They may not want it back, or (2) they may have been willing to sell at the time, but would now want the more valuable land returned to them.
Philosophically, I understand the point, but practically, it would be impossible. If people are waiting for that to happen, they will never be happy because it is logistically impossible.