What the map needs is sewers completely cut out, slums and triumph expanded (being worked on already), and more ways into/out of slums that also lead to plaza; so that EVERY sector is /interconnected/, meaning its easy to go in and out of every part of the map.
This encourages both citizens, loyalists, AND rebels to be in every part of the map and also gives CP's an injection point from anywhere in the map, but also lets rebels escape in other directions as well.
The map is way too big in some areas, and way too disconnected in others, plus sewers is mostly just... "exists" for grinding and no real RP is there so its just wasting a huge amount of resources outside of the few events we have there.
By doing all of the above, roleplay is encouraged in more "hub spots" and its easy to access each hub spot so that it only takes 10 mins tops to find a grouping of people to roleplay with.
If a player needs to take more than 10 minutes to find people to roleplay with, the map is bad because that player will most likely leave. Its the issue we have right now; Plaza is empty a lot of the time except for CP's and maybe 1 or 2 loyalists, shops are too tucked away so most of them do not get visited, and slums has secret bases that people hide in so the average player has a hard time finding people to interact with. So they either find a ingroup / metagame with a friend to find people to RP with, or they just disconnect and do not come back.
Hence what the map DOES NOT need is more areas that segregate the population; an Outlands / Canals portion would be the death of the server as half the server would be in one area and the other would be in the other zone, and they'd rarely if ever interact with each other, creating huge circle jerks and eventually killing the server cause those circle jerks wouldn't interact with new players.