Whites group together and form their own isolated communities, like the Amish. This would be a small portion of the general population, and as European populations decline, these communities if left alone would flourish.

The challenge with this scenario is that white areas will suddenly "need more diversity". Blacks, Browns, and Jews don't want equality, they want revenge. They will use the police state to inject somali muslims and nigerian boko harams into your neighborhood, purely out of spite. Secondly, whites have been trained to hate themselves and welcome their enemies. The only way whites will get their own communities is if there is some sort of collapse of the jewish power structure and end to self hatred.