Actually Europe makes the point well. Talk is just talk. Any domination of Islam will not be be military but by demographics. Put together, they don't have a world class military anything. They were the last one to the nuclear table. If we continue on the way of the Pill, abortions, drugs and gay marriage, they can play for time. In Europe they surely must appreciate our Democracy of one person, one vote, it plays to their strength.
And again while I agree that “talk is just talk” if one small group of followers, or hell one individual, with the means, takes the rhetoric to heart while carrying around a small nuke in any given city, well, those effected might not be able to talk back.