Is it really "Missions cannot be better than trading! Missions are killing the lanes!" again? Remember what happened last time, missions got nerfed into the ground and the game was worse off for it.
The addition of the mission rework made the player count explode in a way trading has been unable to. It's a fun way to make money, that bar some certain situations that people are aware of (ie Delta) are fun, positive ways to make money and contribute actively to the server.
Things really do not need to be changed, The issue with trading is that trading is utterly boring and doesn't feel rewarding. Fix issues with trading, instead of nerfing missions.