I have recently been playing a lot of Starcraft 2 and League of Legends.
What I find really alluring about these games is the automatic ranking and matchmaking system that they have in place.
Having a simple way to get matched up with someone and play makes the games VERY simple and easy to just get into a game and play.
Too often have I found myself waiting in a duel server for a long time, I go and do something else and come back to find myself kicked for inactivity, which is not convenient for the other player either.
If we could have a simple thing (Like the Duel Detective we had a long time ago) where we could just press play and get matched up for a game... that would be AWESOME.
You could even have a little "Approx queue time" like in League of Legends and say the wait for an FFA might be 5 minutes, at least then I would be able to go and do something on youtube before my match starts up.
tl;dr - if Quakelive had a matchmaking system similar to SC2/LoL it would bring in more players due to ease of finding a balanced match and keep the current players more loyal than ever.
I really want to grab the devs attention with this thread, please bump if you support my idea.