Personally, I don't want to play 3v3 Coast City. It's still my favorite map. I want to be able to que for it and be able to get a 5v5 game going just like the good ol' days. As it is now, it literally takes an hour to find a match. No one's going to sit for that.
Turbine needs to do something to incentivize players to utilize the map. They could put first win of the day on each of the maps, so you can get first win bonus three times a day. They could boost the rewards for completing a match of Coast City. Or maybe change the way matchmaking works on it to be more lenient. Really, losing it now would be a tragedy. Something needs to be done, but changing the way it's played when it's already a fun map isn't the right choice.