[PC-viewpoint bias]
Keep in mind that if you reduce the games played someone is going to feel left out. To be blunt, I see the Wii disappearing under this system because there’s always going to be a hip cool fighting game on 360/PS3 that everyone’s going to be caught up in and forget 3 months later (or completely hate after the LAN). Just remember to keep past tournament numbers in mind when deciding on games to play, if a game is continually drawing heavy crowds keep playing it.
You could have tournaments overlap and tell people they can’t play in both, or if they do they won’t be allowed to hold up the entire bracket while they play somewhere else. I know it’s not ideal but people come for diversity and while the PC side can get away with only playing 4 games I’m not really convinced the console side can.
[/PC-viewpoint bias]