Solo Queue Suggestion
I'd like to make a suggestion to shake up and create a new dynamic in the solo queue game mode. It's simple really, although I don't know how hard it would be to do for you but it goes like this:
At the end of a solo queue match create an option for the winning team to click on to "stay together another match." IF and only if all members of the team click on it, they will be entered back into the solo queue or team queues or a new queue set aside particularly for these match-ups (I'd really be inclined to let it go back into the solo Queue for matchmaking time, at least at the start of the program). The team would then carry it's match making stat ratings, and a "pre made" matchmaking modifier--perhaps slightly below a fully premade team's rating modifier (since the players may have got together on Curse or whatnot)--into the solo queue.
Of course this option can be made available to the losing team too, since many games can be really close and the players could have enjoyed their team even thought hey lost, I'd highly recommend it for both the winning and losing teams. Essentially this rewards people for playing not only well but well as a team and as team mates and offers them an opportunity to play again, if only but for an additional game.
It could make the experience of entering the solo queue more than just a one off game. Even thought he odds are low everyone will opt for the follow up game, because people often have other irl commitments, it offers that opportunity, and this opportunity can have an effect on the community and individual's behaviors. It sort of changes the context a little.