Radical Islam will always go on doing its thing, as long as it has gas to burn. Curiously, the entire West is unwilling to go after the people pulling the strings of radical movements - those who give them money, holed up in so-called 'allies' of the West - Saudi Arabia, Qatar and more.
We will go on for decades killing grunts of Radical Islam, all while they take the lives of countless innocents, and not be one inch closer to ending with it. If we had put the sheiks and Imams funding Al Qaeda/ISIS/Hamas/Boko Haram/etc. in prison and frozen their assets, those movements would have died off years ago.