The gate's populations have gone from 300/500 to 50/100. Yeah a major decrease as far as im concerned.
Now I can guess this has happened for 2 reasons.
First, the missions are far more beneficial for making profit instead of the gates. Basically you are not really that clever if you pick the gates over the missions for making crown profits.
Secondly, The terminal and Basil's purpose have decreased around 80%(just a quick estimation).
The question is, What should 3 rings do to give the gates back their purposes? Or should they adjust the hall of heroes?
I heard a rumour that the bosses in the gates will be replaced by new bosses.
Sounds like that would work to me.