I was told, when I was in Sicily years ago, that the Mafia was the stable underground government of the Sicilian people regardless of which nation had taken them over. The Greeks, Norman’s, Arabs, Bourbons and etc. were all occupants at one time.
IMHO the Mafia may rise and become useful to the native Sicilians once again.
It will be tough since many of the Mafia are now in jail, and Sicilians have less fear of the Mafia and have signs in some restaurants stating they don't pay money to the Mafia.
The Sicilians can't count on the Govt. expelling Muslims anymore than we can here in the USA.
I just talked to Frank and he said the Muslims were coming into Palermo at a rate of 1,000 per day, when he was there.
That is why he did not go back to Sicily this winter. -Tom