Once colonizer now will be colonized by the people of the land that they once colonized? I dont have any sympathy for them because now finally they might get a taste of their own medicine. You reap what you sow!

The thing is those colonizers' countries will not be flooded by those immigrants if only they didn't colonized those immigrants' countries at first place, stole all their resources dry until the people left with nothing to develop their own countries, thus forced them to immigrate to those more developed colonizers countries.