I know what you're thinking... Ian, you crazy mofo! WTF are you thinking? Well, to tell you the truth, this map is pretty unlikely, but I'll stand by it. The parties will centrist-ize, I do believe, and social issues will be put on the backburner. An election based solely on economic issues, which is what I believe the future of American politics will be and following trends creates this map:
Um, why is Missouri and the states bordering it voting for lassiez-faire economic policies?
Why is Nevada and Arizona voting for pro-government economic policies?
There will still be people voting for Republicans because of social issues, just like there are still people today who vote for Democrats because of the Civil War, though neither are issues at all or will have been for a long time. And I think that the south will be so conservative that it will stay that way for a while after social issues are less existant.
As far as NV and AZ, I just stuck them with the Democrats because of their current trends to the left.
