"How feasible is internment now? Where will the mobs stop? Will people like me (brown but red blooded) get it also?"
Let a car bomb or a nuke (God forbid) go off in an American City and internment might "might" happen.
Unfortunately with the PC mentality of the people in positions of leadership in this country, I don't see it happening until a cataclismic event happens to force their hand.
There will be bodies in the streets...literally.