I've searched this last year ago, and i'm surprised that there is already a suggestion, i'm wondering if they stopped the project or not, but I hope not since this will be a good thing to the osu community. So, any news about this project?
Just like clans in any other games?
I don't think osu! is about it. There is no such competitive, just a game for fun.
If it's just about gaining ratings then idk, I don't think this is good idea for such game as osu!.
If it's about finding teams (like in E-sport) then it's good only for tournaments, but still not quite good idea...