It would work a whole lot better if we could get them to hire the mentally unstable into sensitive positions out of 'Inclusiveness' and 'Diversity,' but I don't think they're stupid enough to fall for it.
Counter the narrative in online Isis recruitment videos – including professionally made videos and amateur battle selfies – to avoid, as best as possible, the deliberate propaganda targeting of desperate and disaffected youth. This would rapidly prevent the recruitment of regional and western members.
Downright silly, the target audience of the ISIS videos will tune out anything that's obvious counter-propaganda and the ISIS propagandists will turn around the counterpoints faster than we can rebut new issues.
Set clear, temporary borders in the region, publicly. This would discourage Isis from taking certain territory where humanitarian crises might be created, or humanitarian efforts impeded.
That should go over really well with all the sovereign governments we're trying to get help from, though the Kurds might actually buy into a promise we can't deliver.
Establish an international moratorium on the payment of ransom for hostages, and work in the region to prevent Isis from stealing and taxing historical artifacts and valuable treasures as sources of income, and especially from taking over the oil reserves and refineries in Bayji, Iraq. This would disrupt and prevent Isis from maintaining stable and reliable sources of income.
Not going to happen. The Continental EU countries are still going to pony up, just like they did with the Somali pirates.
Let Isis succeed in setting up a failed “state†– in a contained area and over a long enough period of time to prove itself unpopular and unable to govern. This might begin to discredit the leadership and ideology of Isis for good.
Should work about as well as allowing Hitler to set up
Grossdeutschland, Mussolini to achieve his irridentist goals by regaining all the old Roman territories, and Putin to incorporate every place with a substantial ethnic Russian population into Great Russia, and then waiting around for the crash.