Here's my suggestions for improving battle stadium.
1. We need you good battlers to get yourself out there on youtube, especially in the big tournaments. The more pokecommunity reps the better. There's several big tournaments going on right now. That could be a start. You see Killernacho, wilechase, etc advertising their boards.
2. Leagues..need to be focused on quality not quanity. Too many leagues were being allowed and they did hurt the more established leagues. I would suggest allowing H+S and Piplup's league to be the only two leagues allowed for now. H+S can really use some established battlers as gym/elites.
3. More cooperation between mods and people that battle around here. More brainstorming for ideas, etc.
4. Clans(might open up a can of worms here) I'd suggest a trial for clan formations so they can battle one another in tourneys, etc.
I'm throwing out stuff here. I'd love to see this place buzzing again. If you got better ideas or suggestions lets hear them. Its up to us to turn this place around.