does he mean vaccinate, as in protect against more threatening aspects of islam?
or that we don't have enough oud music?
or did he mean enrich our cultural plasma some other way? ~"When an inner situation is not made conscious, it appears outside as fate." Karl Jung~
Also, a nation cannot expect immigrants to lose their identity and lifelong cultures in exchange for mimicry of the people they are now surrounded by.
Cultures must accept those who join it willingly by doing their part. Surely they will find useful things to take, usually food is the first, followed by fashion, arts and music. Eventually, especially over generations, you find the ideas of the immigrant cultures penetrating the national psyche.
Simply look at the United States where cultures that were considered very foreign to each other have completely melded to an extent that most people are unaware of ethnicity at all (not that ignorance is admirable in this respect). Many things that are considered hallmarks of "America" were foreign and resisted 150 years ago. The same can be true of anywhere, in fact that is exactly what some are resisting.
i do admire the melting pot aspect of america, and am enjoying seeing how many young europeans i'm meeting are so much more international in worldview than in previous generations.
but we are far behind still, even if one factors in the language issue.
cheap travel, the ERASMUS programme, ubiquitous 24/7 world news, and the internet are globalising the young in a good way.
your comments about immigrants and indigenes meeting halfway are right on point. ~"When an inner situation is not made conscious, it appears outside as fate." Karl Jung~