Hm, here are some of my own thoughts on that:
Virtus.pro: TaZ is still the best Polish IGL, I think he'd be the best choice to add though there could be conflicts with Snax and TaZ.
Ninjas in Pyjamas: I think Lekr0 is doing a fine job IGLing, flusha is taking a break and took up the IGL out of situation more than want. I think it'd allow more room for Lekr0 to be a star player which is good but it'd take time until flusha would really be able to use players like GeT_RiGhT to their full potential.
Cloud9: They're likely going to keep autimatic and kioshima, I imagine Golden as well. I was looking for a more standard fix that they probably should go for.
mouz: I think karrigan should focus on IGLing and allow chrisJ to focus on his aim. Chris has more potential than karrigan as a rifler.
FaZe: Interesting fix, Aleksib would be safer at the moment. I think ideally they'd want gob b to be honest.
Na'Vi: If they were to fix (Which they probably shouldn't), -Zeus, -Edward, +Jame, +qikert for sure. Good fixes