Really north , it isn't rocket science.
Countries like france, Holland etc are seeing a lot of muslim enclaves.
Now we can PRETEND its all "rich tapestry win/win" but the public have stopped buying it.
As a rough , Hugh Mackay type guess I would think 50 % of the population of france are worried about the muslim issue.
If the centrist politicians wont address the issue , then the right wingers will gain ground.
So its up to the moderate muslims and sensible politicians to relentlessly stick the boot into the "non assimilators".
Its in their best interest.
This is just common sense and pragmatism.
Of course, for this reason, it is unlikely to happen