Islamic decline.

Historian Paul Johnson points out one good thing about Islam, to wit, that its present eructations are a symptom of decline:

Islam is in gradual decline, like Christianity, Judaism, Buddhism and other world religions, especially in their heartlands. The fundamentalist descent into terrorism is more a symptom of long-term sickness than evidence of radical health, and it is likely that by mid-century, and perhaps long before, large parts of traditional Islam will have collapsed into secularism.

He's not overjoyed as he thinks this will leave secularism dominant in the world, where it has enormously destructive potential.

"The human race: success or failure?" By Paul Johnson, The New Criterion, Nov. 2006.