But the Kosovo model seems apt on many levels.
At a certain demographic tipping point, it becomes impossible for a border region to control its frontier, since local governments are controlled by pro open immigration recent immigrants. This process really snowballs into an unstoppable avalanche in the later stages, which we are approaching.
Once the border states become majority Mexican, the radicals will become emboldened, and push for Spanish only laws and other flagrant displays of power. The most radical will snipe "anglo" police and politicians to provoke a response, the radicals will flee into the barrios. The police response will create collateral victims, and (the radicals hope) new recruits to the radical cause.
I think we could see terrorism and guerrilla war in the Southwest within 20 years. I would not buy real estate within 100 or 200 miles of the border.
I hope I'm wrong, but I recall how the Kosovo Serbs used to love their "cheap Albanian labor".
I always saw England as Greece, the bearer of culture to the world, and America as the Roman Empire, powerful with serious internal weaknesses. The Roman Empire did collapse while Greece, like modern England, slowly faded away...
Of course, there is a Darwinian argument that could be made here. If Hispanics are more numerous and the whites are generally only interested in luxuries and not producing offspring don't the Hispanics "deserve" the Southwest? Philosophical question of course...