I doubt it changes anything. The ruling class themselves, regardless of who or this and that they be, have always been few against the many, but the many rarely revolt. Power structures rarely change without any of extreme significance that directly effects the ruling class in a significant enough way to demand their attention. It also depends on how long the Republican party is the face of the white white. And then because Reps and Cons do tend to vote more often and frequently than Reps and Dems I am doubtful shifting population demographs will cause significant changes in American politics. There is also the reality of what Trump may feel empowered to do if he is given a second term considering some of the things he has already done. And I don't see him caring about how he leaves things for his predecessor regardless. With increasing nationalism across the Western world, it may be possible we may soon see an increase in the birth of whites as having babies for the state tends to often go along with such ideologies.