I don't want to burst your bubble, but the developed world, or rather the people in charge of it, took a good look at you guys and decided they wanted to live as kings as well.
Ever since then, they have steadily dismantled institution after institution while telling the people that immigration is the reason their life is worse. It won't be long until we won't have access to good free medicine; safe, good and cheap education; and all the other qualities of life we've enjoyed for so long.
75 years is a very optimistic timeline. The things you mentioned are already starting to happen.