Two people starting at ground zero, devising a prenup that would encompass all future earnings and assets derived from that future income, and keep them sole and separate and as well no alimony for either party, would be tough to devise, and implement and even if written might be thrown out for unconscionability when the divorce came that many years later.
Prenups do a good job of protecting assets in place at the time of marriage but don't always work perfectly for all things future, especially not in the scenario you describe.