Whether its Kongai, Zening or Dinowaurs, the best players automatically head to chatroom 1.
This means that the best on topic and interesting discussions take place in room 1 and everyone who wants to participate or just listen goes to room 1. The other rooms are dead, or have off-topic talk in them.
I believe bigger room 1 in mentioned games would enable more people to participate or just listen to on-topic discussions about these games, and thus, reinforce the community aspect. I would even go as far as having only one room.
I am aware there might be some reasons for Kongregate to make many small rooms:
1) Limits of technology: for this I have no counter argument.
2) Easier crowd control: here I have to counter: trolls often run havoc in these small rooms, because there isn´t enough mods for each room.
One big chatroom would have more trolls and troublemakers in it, but on the other hand, there could easily be 2-3 mods online each time, enforcing strict rules. (with help of very strict automated modding)
Another idea: If big chatroom is impossible, how about themed chatrooms?
3 card strategy talk
5 card strategy talk
off topic 1-10
Army strategy talk
Hero strategy talk
vets helping newbies
I am sure others will come with other ideas for chatroom themes.