We personally think that Valve could extend this even further, by gauging the top 0.X% of players playing in a particular region at a time, and giving them all a notification that they have the ability to wait for a high ranked match. Given that regions like North America have historically had problems with lower playercounts and lower numbers of players within the immortal category - you could extend it to the upper echelon of divines as well. While still not optimal, it makes sure that even in times when fewer people are playing the game, you can still have an optimized experience.