At least they are trying to fix one of the issues of Alt+F4: The inflated ratings. You dont have to quit any more, if you dont want to play with you noob ally with low winrate, because his rating is inflated.
Not sure if this will instantly have an impact on the number of Alt+F4’s, but at least it is great to see that the devs are looking in these big issues. I wont be surprised if the Alt+F4’s are the next big thing they will address.