Peshmerga ("those who confront death") seem well organized, and motivated.
They do. Perhaps the best organized and motivated fighting force in Iraq.
It's beginning to look like a win for the Kurds.
Yes. The Kurds are going to end up with de-facto independence, to say nothing of control of the important oil refining city of Kirkuk that they've always coveted. Kirkuk once was overwhelmingly Kurdish, I believe, but Saddam Hussein moved large numbers of Arabs there. Now the Kurds seem to have claimed it back.)
When this is over, Baghdad will only have nominal sovergnty over the Kurdish region, and perhaps not even that.
It seems that the Iranians are only moving into Iraq's eastern border provinces.
And the Shi'ite holy places. I'm not really sure what's up with the Iranians. Tehran denies that any of its forces are in Iraq, but is offering to send them if Iraq asks. But the Iraqi government is saying that Iranians are already fighting in Iraq. (I'm inclined to think that they are probably already there.)
I'm just speculating, but Tehran might want Washington DC to take on ISIS on behalf of the Shi'ites. And the Mullahs may fear that Washington might get cold-feet if they think that they would be fighting alongside the Iranians. So Iran might want to keep a low profile for the time being to avoid scaring the Americans off.
With them and the Kurds, Isis has a very long exposed flank--------I wonder if a combined counteroffensive could trap them or force them west into Sunni lands?
I still think that ISIS might be more vulnerable than people think. Reportedly they have less than 10,000 fighters total, including both Syria and Iraq. The number given for ISIS fighters in Iraq is said to be about 4,000. They've taken many places with only a few hundred men each. Their success is more the result of the weakness of their enemies than of their own military strength. They are filling the vacuum created when the Sunnis refused to fight for al-Maliki.
So... anyone who wants to attack ISIS (the Peshmerga perhaps) could probably slice right through the areas they occupy on the map. (The prospect of street-fighting in Mosul is worrisome though.)
I'm not sure if the Kurds really want to capture territory though. That would mean occupying areas with Arab populations which might become a major headache. So I expect the Kurds to defend their own turf, probably pretty effectively, but they probably won't launch a bigger offensive.
Of course capturing a treasure trove of Iraqi military equipment in Mosul (much of it American made) strengthens ISIS tremendously. (They suddenly have everything from Apache attack helicopters to surface-to-air missiles.) And they are probably getting lots of recruits from Sunni Islamists who are thrilled with their success. (Just as militant Shi'ites seem to be flocking to enlist against them further south.) So if somebody wants to attack ISIS and roll them back, sooner might be better than later.