Make quick rooms faster.
They are called quick rooms, so why is there a line? I'm not there to socialize, that's what streak room is for.
Make it so that 1 arena is either able to hold infinite amount of people, and every pair of people fighting has their "own" arena
Sort of like using a different channel.
Or
just make more arenas in the same room.
I like the 1st option, because it uses less space.
Once you join, you start the match, no lines, quick, and simple.