Because people would go off topic way too much. The non-sense of Scott Hall was the final straw and besides when the newest update is close, some people get a little crazy in the discussion channel and then the channel becomes unbearable ie the dude who was just talking nonsense. Besides when someone is clearly trolling you really should not give the said troll attention. So in short the reason it got locked was because people can't follow rules and like to be trolls for no reason.