I think is it correct to "dismiss" from a guild inactive teams... if you browse guilds team u can see there're a lot of teams without any championship or match in schedule.. i think you can automatically dismiss from a Guild all team not playing from two seasons... and close a guild if there's no team in it.
For example see the guild "Los Mandarinos" ...
The problem is this guild (having 24 teams) is purposed to new team as guild to join... now, if a new player sees a situation like the one in the example will be not motivated to play again and grow!
Another problem is that more "glorious" guilds are not displayed..

If you don't want to dismiss inactive guilds at least don't suggest them!