This is the one point where I disagree. I think it's a bad idea to bet on them, because their tactics don't lead to a plausible end game scenario. The fact is that the American public will build up a reserve of hostility towards Islam that will eventually boil over because of some specific event, most likely a WMD deployed on a major American city.
That will not be a good day to be a Muslim in America. Mecca will most likely become a large radioactive crater soon afterwards, and then WWIII begins in earnest.
We've had our Reichstag fire, and soon we will have our Krystallnacht. Mark my words on this one.