It depends a lot on exactly what form the system after America takes. There’s no given answer for how land will be redistributed, how the question of Nationalism will be answered, exactly how much cooperation there will be with the indigenous bourgeoisie (esp. the Petite Bourgeoisie). But I think there’s a few forces to keep in mind, which I’ll phrase in the form of counterpoints to strawmen:

“There just aren’t enough Indians left to repopulate the land” - this is false. Human beings have an amazing capacity to make more of themselves. With proper monetary reparations and incentives, the Indigenous population could double every generation. Within a century, they could outnumber whites.

“You can’t just take away people’s homes!” - I think there are separate counterpoints for urban, rural, and suburban homes - the first is that, especially in our densest areas, most people are renters who are largely migratory anyways. When talking about land redistribution, in these cases the important part is not that the whites leave but that your white landlord is replaced by an Indian landlord (or the housing board of the autonomous indigenous state, if we’re talking about a more Socialist future).

And when it comes to single-family housing, I think a Socialist future would come with a significant drive for increased density anyways - we’re going to be bulldozing white neighborhoods anyways to build denser housing, leaving plenty of room for indigenous people. New indigenous neighborhoods could be built over wealthy neighborhoods whose inhabitants have been dispossessed, or in redeveloped land previously taken by big box stores and golf courses.

And for rural areas, commercial farming can be turned over to indigenous owners, and family farms are sort of a dying model anyways - there’s plenty of Whites eager to be bought out and plenty of land (either greenfields, or commercial estates that can be parceled out) for new family farms to be built, if desired.