Been reading these threads avidly. Great work!
And I have a number of questions - been wondering whether to start each as a new thread so that discussions are quite specific.
In this case, re new top-level subject forums, I think if people look into a restaurant and see it's empty, most won't go in. Same here, I feel. People will come and participate if they see forums they find interesting.
Do you have a mechanism and schedule for setting up new subjects, including choice of mods etc?