A ranked system in 1v1 duels.
Progression goes up after winning, progression decreases after losing a match.
Maybe some ranked only cosmetic rewards along the way, which changes each season (end).
The Icon of your current "league" will be displayed in public lobbies behind your name, when looking at the scoreboard. Also will be displayed in the emblem card you see when you get killed.
I believe it will only add some more variation to the community. It's not necessary to play if you're just a casual gamer. With that said, not many "ranked only" rewards should be available.
I've made a small example on how it could look to keep track on your current rank, and what's upcoming.
The designs of the league emblems are not done by me, all copyright to the original author.