Thing is, where would you like the board to be? Even though League is a brilliant game it's not really community/clan supportive therefore it's pretty weird to have a board for it here.
Also take Demolition as example, they have a league board and it's dead without any discussion. On the other hand we have a lot better / more active forums so could give it a try. I'm neutral about this for now, want to hear opinions of others. But yeah, for now, more negative than positive opinion on this suggestion.