A fictional treatment of these issues you might be interested in is the book https://en.wikipedia.org/wiki/2312_(novel) by Kim Stanley Robinson. Spacefarers are genetically distinct from Earth-dwelling humans; each planet is its own political entity.
To me, determining what will happen in the future seems less and less possible the farther we go out, to the point where I think there are no arguments that would give me a high degree of confidence in a statement about the far future like the one you put up here. For any story that supports a particular outcome, it seems there is an equally compelling story that argues against it. :)
A fictional treatment of these issues you might be interested in is the book https://en.wikipedia.org/wiki/2312_(novel) by Kim Stanley Robinson. Spacefarers are genetically distinct from Earth-dwelling humans; each planet is its own political entity.
To me, determining what will happen in the future seems less and less possible the farther we go out, to the point where I think there are no arguments that would give me a high degree of confidence in a statement about the far future like the one you put up here. For any story that supports a particular outcome, it seems there is an equally compelling story that argues against it. :)