I don't think we'd need to go that far. I'm thinking a concerted effort to get people into chat would be a better step (e.g. stickies at the top of the appropriate boards about why you may prefer chats as your good/bad steam outlet during games).
There's always going to be some chat-like posts in a game thread. There probably even needs to be. Even Victorian Era Brits must have sometimes felt the need to say something brief (though I'm not sure written proof exists).