Basically, the reason that some cultures and nations fail and that others succeed is the people who live in the nations and who make up the cultures.
Sure, there are exceptions, but, when considering an immigration policy, why not prioritize immigrants from successful (read: European) cultures and nations?
The primary flaw with your plan is that citizens of successful cultures and nations generally are happy to stay where they are.
I am taking liberties here, but I would offer that our Freeper friend MadIvan is proud to be an Englishman, he has a rewarding cultural bond with his countrymates and he has a visceral investment in his homeland that is about roots and history and community. I bet he likes being an Englishman, living in peace and prosperity in England. Why wouldn't he? Germans like being Germans in Germany. The Swiss are not sneaking across the Canadian Border. We aren't catching the Royal Family of Monaco hiding in Orange Crates on Panamanian freighters docking in Charleston.
People who are poor, oppressed, desperate and seriously committed to leave a life of hopelessness and misery for one of opportunity and prosperity are going to come here. All the blonde haired, blue eyed folks who aren't here are happily living their lives quaffing litres of ale and playing cribbage in Stockholm, Rotterdam and Hamburg. The Spanish love their country, the Italians like their way of life, the French are the French. That's all good.
So, we will be the destination of hope and well being for people from Somalia, Hmongs from Cambodia and Laos, Mexicans, Haitans, Indonesians, Chinese and Koreans.
The Norwegians are staying in Oslo. Ivan has his pub mates and his Page 3 girls. They're not coming here for freedom or economic salvation anymore. They're doing well, and they like being who they are. Sorry.