Yeah the magical world might end up as just a extension of the human world's culture through the children of normal humans that were raised in the human world before being sent there to be treated as equals of the "pure" magic familiesIt would be interesting if part of the reason pureblood families are so reactionary is that they feel they are being colonized by first generation mages. There is a class aimed at the normal world, where is the class "the introductory to the customs and norms of the magical world".
That is one aspect I never see being taken into account