The nation is rapidly polarizing. I honesty could see calls for secession/balkanization become relevant. Especially if trends continue and the EC goes blue, but Senate goes red and stays that way (more states are red than blue, republicans being more likely to ticket split is the only thing giving the dems a chance in the senate, and ticket splitting is declining). This results in a deadlocked nation where neither side can get anything done. Call me crazy, but that sounds like a recipe for trouble. Peaceful separation may be the best option. Neither side wants to be dominated by the other.
You realize that that would be practically impossible? With a few exceptions (rural Texas panhandle or inner city Chicago) no place is 100% to one side. Splitting America into a red and blue nation would do absolutely nothing good. And if you wanna do a "partition" with people moving and all that...no, just look at how those things have worked out in the past.
Plus you have to realize that 1) areas shift, often pretty quickly, like look at Orange County or West Virginia. Second of all, even if you managed to put every Trump voter in one area and every Clinton voter in another, kids don't always grow up having the same beliefs as their parents. Wouldn't it suck to live in a nation where literally nobody agrees with you?
Point being, this is a dumb idea in so many ways.