It's already happening
Mafketis always speaks a lot of sense no this topic but I agree.....it is already happening.
I have seen first hand how it works. Muslims tend to ghetto-ise certain sections of a town or city. Then, when they have enough numbers, they either vote for a political party in the local election who is sympathetic to their culture i.e. a left wing party or a muslim candidate (who generally represents the left wing anyway).
Muslim roots become deeper as the years go by. The Left Wing party loves them as they are a guaranteed vote. The muslims don't split their vote like the rest of us-they typically will only vote for one party which is a powerful voting strategy in elections.
People seem to think that social change happens from a national, government level......it doesn't. It happens unnoticed at a small local level and then spreads. By the time it becomes an issue the government and public authorities are already having to switch into "reaction mode".