Looking at the Southern birth rates and Northern abortion rates I do believe the South will rise again-
it just won't be whistling Dixie...
One part of who gets elected to Congress is a little thing called gerrymandered districts. It is a neat trick, carve up enclaves you don't want to have a representative between two or three other neighborhoods. Dilute the group, be it a minority or a political party.
It is going to take awhile for white folk to feel like black folk. The high birth rates are indicative of a high immigration flow. Once in this country for a generation or two the birth rate of falls to the national average. The boost some religious sects get, like Roman Catholic, doesn't carry too many generations into this country.
I have noticed many white folks in my part of Oklahoma are truly worried what will happen to this country once 'they' take over. I figure if these same white folk spend the money on proper education, and I don't mean the self stroking myths, as well as a realistic districting plan, then the melting pot is good to go.