I agree, though that won't be that big of a change within the cop side, as people will still rather to play as criminals, just because there's more things to do. I mean, if Player X is new in the server and has to choose if he would like to join a gang and do stuff together with his gang mates or do a squad that will easily get higher level.... well, in the current state, the answer is the first option, obviously.
Yes, I agree to do that, but temporary, till things get a bit better. As during that time, there could be things getting added for the cops side, yet still related with the criminal side. For example, there could be a transporting a vehicle (that can't be damaged and has a limited speed) from a PD to another, it can be triggered when at least 10 cops are grouped up in a PD. Thats just an example of something that can be added that could spice up the gameplay of the cops, as well as of the criminals.
One other thing that I notice within the cop side is the obvious seperation between each other. There is literally no team work within the squads, I also honestly haven't seen new players (that are spawned as trainees) getting that welcomed from the official squads. Maybe talking a bit more, showing some good attitude towards possible members, as well as doing stuff together (possibly doing squad trainings, where all official squads and cops can do stuff together to practice, while off duty), etc, might get the people interested.