With the actual immigrants, and their children, it seems that the integration's machinery is broken. They keep a strong links with their original countries (via satelite TVs, internet, summer holidays in Algeria or Morocco...) and, a part of them tend to partly or totally reject the french and european values. And that is really alarming.
Read "While Europe Slept" by Bruce Bawer. He and his male lover moved to Holland from the U.S. to experience the famous Dutch tolerance. No more. He was shocked at the Muslim takeover. One out of three Dutch want to leave. The murder of Theo Van Gogh by radical Muslims has been a wakeup call for many complacent Dutch. Things are rapidly going downhill.