you don't understand what you are talking about, it is not about extra flight hours, it is about the cost......airlines require permit for overflight, and they pay heft amount for utilizing the airspace.
Now that airlines have been forced to take a long route due to closure of airspace, not only they have to pay extra fuel surcharge they have to pay a surcharge on the use of airspace too. Emirates flying out of Dubai doesn't need to make a stop over at Mumbai for refueling just to land in SEA, they freaking flyout a 787 dreamliner or a 777 or a 747 they a 5 1/2 hrs non stop flight......the only stopover you are going to get from this are the Central Asian based airlines heading to SEA because they have to move all the way from Iran......they are already pulling their hair out......and that is going to hit you back to because your airlines have to pay the surcharge too for use of airspace.....
them being a baniya, they will only focus on Incoming going up, they will not look at the Revenue generated and the cost that has been paid.....they will understand it sooner or later......it was really a joke to read a comment that emirates stopping over in mumbai for refueling....