In order for immigration to come to an end (although I personally can't understand why anyone would migrate to Europe) Europe would have to take any influence it has in said countries.. You can't occupy, pillage, and leave places in utter burnout and not expect it to come bite you in the ass, although admittedly England especially had a history of doing so, especially in areas like Hong kong-- imposing open door policies on China, forcing them into Opium addiction. Or taking completely over the diamond mines of south Africa.. YOU CAN'T HAVE IT BOTH WAYS, and then whine till pigs fly ..
in the end it isn't about money, Caucasian(ness) or power... it is about the ability to survive it all!
You simply reap what you sow!
all the best