It's more complicated than that, at least now. Having land, even crummy land away from the ancestral homeland, is better than not having land, because:
a) you can afford to live there, as an extremely economically disadvantaged group.
b) your tribe is in one place, instead of scattered, which makes it possible to continue to have a group identity and
c) you have at least limited autonomy.
I know people in tribes that have been shafted by the BIA and refused official recognition or land. It hurts. See the documentary "Promised Land" [0] for their account.
0. https://www.promisedlanddoc.com/