Even if ISIL disbanded by themselves, there would still be a violent movement there, and another organization with a different name (thankfully, as I’m tired of people writing “ISIS”) would emerge.
The “War On Terror” concept needs to be replaced by other types of thinking that have some prospect of positive resolution.
As citizens, I think it’s also a mistake to identify with our own governments’ policies as being simply something “we” are coming up with based on “our” best interest, since it seems to me this is at best a nice story the corporate-bought government and corporate media use to have us not notice that they drive what our military, government and diplomats do in the world, and why world events and situations have been as they have. It has little to do with what would really be good for people. Many people hate the Western nations, and we invade them, based mainly on multi-national huge corporations who operate the modern version of colonialism, dominating foreign governments to extract as many resources as they can at low and predictable prices, without benefiting people at large except inadvertently or for show and to gain more political influence, for the purpose of getting the highest scores in the meaningless human-invented games of accumulating more and more wealth and power, mostly to the detriment of everyone and everything else.