As I stated in my original reply there are changes coming soon, but I anticipate they will be more likely to deter players from trying to play again if they leave a game (possibly low-priority queues if anything).
In the end, being desperate for a change in the rules of Competitive Play or the leaver system does mean the game has to immediately change right away. There have been many planned and deliberate changes in the early days of Overwatch when handling leavers, but there have been many reasons why many ideas don’t happen. I have tracked these responses from the devs here.