Sheikh Mahmud proclaims himself King of Kurdistan; the RAF bombs his house in Sulaymaniyah.That'll have learned him. All a bit imprecise though, in those days: but times have changed. Precision from the skies above 98% of northern Iraq is pretty straightforward nowadays, and I write as someone who spent many hours gazing down on that part of the world in 1990-91. Saddam, who had the entire country at his disposal until the closing days of February '91, had the greatest difficulty in hiding his Scuds from aerial view: underneath motorway bridges was a favourite, but most of the needles were found in that very large haystack in only a few days.
There aren't many motorway bridges that I'm aware of in ISIL's territories, and although small vehicles can scrim up fairly easily in towns, there's nowhere to hide when they come out to fight. So the scene is nicely set for a very effective deployment of air power. If ISIL proposes to give battle it will be a very one-sided affair if the USA so decides. They didn't even manage to sabotage the dam.
Perhaps they are hell-bent on the 72 virgins thing and will give it a crack anyway. Otherwise, it's no more sweeping territorial gains for them (again, if Uncle Sam says not); just falling back to nasty deeds in the towns it already holds, pending gradual re-investment by various other forces in the land. And maybe some hit-and-run against oil installations.
Equally likely, though, is surely a strategic melting away, with the leadership consolidating somewhere out of sight with its apparently large sums of money, waiting for an opportunty to spend it on something else unpleasant. If so, the rank-and-file could soon be returning to their native lands en masse. A scary prospect: and do we imagine the Border Agency is up to the job ..?
Footnote: that oil price is inching ever closer to $100 ...