My reading of that is there is no way to "incorporate" a 7th century culture into a postmodern society. We are already seeing individual rights being subsumed for the muslim "citizens".
Articles and books which try to minimize the greatness of the west or attribute its rise to outside forces, as this article does, are undermining the very confidence the author says is necessary for the integration he fancies.
Cultural confidence must be homegrown, the attack on "nationalism" is self-serving for the cosmopolitan elite that have no allegiance to the native peoples of Europe.
He quotes arab apologists to support his notion that Europe is dead and can never again be a strong and thriving culture.
The answer is defeatism and dhimmitude because while the European elites are too sophisticated for nationalism the islamists certainly are not and will use it to subjugate the Belgian and the French people while their so-called leaders congratulate themselves from behind high walls.
But what the article nearly touch upon (walked up and touched...then quickly ran away) is how islam in Europe is giving rebirth or renaissance to the Right and its basis in reality as opposed to the basis of the Left which is fantasy and idealism.