A long time ago in a galaxy far, far away, APB Used to have districts that were not sorted and restricted by threat levels.
You could join any district you wanted to and play whomever matchmaking decided was fair opposition for you.
Prior to that threat was divided into Bronze 1-10, Silver 1-10, and Gold 1-10 (And sometimes Blank/No threat, which happened if you passed Gold 10 because bugs.). Once you hit (for example) Silver 10, and then gained enough threat you were promoted to Gold 1, then 2, then 3, etc.
Along with that you still kept your rating level, as now. But back then it only went up to 195, of course. (Even though up to 300 is planned and implemented in the files already, but that's a different discussion)
I think this is a better system than the current system, but the best system moving forward IMO is a removal of visible threat and threat segregation.
Let people see what threat they are themselves. Preferably in the old 1-10 style to give a more granular representation of how good you are in your bracket.
No one else should be able to see what threat you are, and you should be able to join any district you want.
This should let people play the game more in-the-moment and have less preconceived notions of how well or poorly they're going to do in the match.
It would also mitigate dethreating. Both as a way of "Escaping the gold cheaters who only play in silvers and pick on the poor silvers. They have their own gold districts why don't they use those :^(" -and- "lol lets go stomp on some scrubs eksdee xd".
Gone off topic a bit but it ties in some and expands upon it.