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They only stoppoed doing that around 1950s after the italians and other eruopeans got totally more integrated by becoming soldiers in WWII.

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Exactly.  And that's where it ought to lead to.  Instead they'll think of themselves in terms of this new hybrid culture (though bear in mind that time is perhaps the biggest factor in the evolution of culture) and all identification with the cultures we think of today will be more or less irrelevent.  Instead they'll have this new culture, in contrast to the many other new cultures around the world they come in contact with, where they'll likely be thinkng about the same issues about integration, but differently as they probably won't have as large a collection of groups and different cultures that we have today.