I'm a firm believer that demographics fall in line with election results, not the other way around. We will eventually have a Democratic president who oversees disastrous economic times and/or an unpopular war, and there will be a realignment due to the self-correcting nature of our politics.
I'm not saying this will break the dam, but it will put a hole in it. I don't think Republicans are going to win the black vote all of a sudden, but they could garner 20-25% in the case of a cataclysmic Democratic administration, which would be enough to dramatically change the map.
We're in a Republican alignment right now though?