When you say you cannot wipe them out. You are making an false statement. They could be wiped out.
That they won’t be wipe out is likely true, but the capability exists. If it were the Romans, they would kill all the Muslim males over the age of 4, disperse the rest, and give the land to more agreeable people.
You cannot wipe out an ideology by killing people ... especially people that are 1.5 BILLION strong and increasing exponentially in population, a certain percentage of which are coming of age every day and are radical.