Iraq might be the only exception along with Yemen. It's debatable because you can always go to the next level once country x or y has been divided along sectarian or ethnic divides. Since I have relatives in Iraq on my father's side I follow Iraqi media and events there on a weekly basis (or at least I try to) and you might not be aware of this but for instance there are certain politicians in Basra who want to have autonomy as most of their oil goes to other areas of Iraq while the most oil and gas rich area of Iraq (second biggest city too mind you) remains largely impoverished. What about Anbar where you have pro and anti-Daesh tribes? Some opportunistic individuals might want their old emirates back (Dulaim etc.). There are a lot of dangers. I will let the Iraqis who live in Iraq decide that. All I can say is that it would be a bad thing for the region if the Arab part of Iraq was divided into a Shia and Sunni Arab part of Sunnistan or Shiastan. That would just be the confirmation of all the ills that we don't want to see becoming victorious. Also if that occurred you will likely see Syria being divided too. What's next after that?
I don't have any problem with autonomous regions at all personally but they mostly are limited to distinct areas in terms of ethnicity in the West + Russia. I don't see a logic in why an Iraqi Sunni Arab from Adhamiyah (Western Baghdad) should live in a different country than an Iraqi Shia Arab from Sadr City in Baghdad.
I say this also because (most people probably already know this here) I am against more divisions in the Arab world. We need the exact opposite.
For instance KSA being the 12th biggest country on the planet and quite diverse in terms of historical regions could potentially be made into several entities again. Is that worth it? Not at all. Esepcially not as Arabia is already divided into 7 countries. 8 if you include Jordan.
Of course the number of nation states is not that important again if you live in a region that is highly integrated such as Europe (EU) but that's unfortunately not the case in the Arab world and that's why, despite not liking everything that the regimes of the GCC are doing, I am a big fan of the GCC as a model.
So which side is Walid Jumblatt on this time around?
Jokes aside, very welcoming news as written before.