My belief is that a new alliance against world-wide Islamofascism will emerge among the USA, Israel, Egypt, Jordan, Japan, India, possibly Russia, and maybe even China to some degree. The United Nations and world opinion be damned once Europe falls under Sharia Law and its culture and history is decimated by the Islamists. I may have the wrong nations involved in my scenario, but I believe it will happen.
It will definitely be time to go Dresdan and possibly Hiroshima on them, collateral damage be damned. It will be the only way to stop them once Europe is gone.