I am going to vote this suggestion down and here is why.....
The current population (on NA at least) cannot handle it. Generally we have one financial and one waterfront. If you make the population smaller in each district it will create more overflow districts and people will be more likely to join those districts. If say Financial-2 is 50/50 and Financial-5 is 10/7, people will just spam FN-2 thinking the other district is dead. If they have to spam too much they might decide not to play, sit in social instead, or play fight club. If the district is smaller, say 35-35, 10/7 it might encourage people to fill it up.
I say the more district options we have, the better. If anything, decrease it to 35-35 and give us more districts.
Now....if the population on NA goes up to like 1500 or so, then I could see increasing the population as long as the servers can handle it.