When all discussion is stuck in a single thread for a period of 2 or 3 years, you will naturally see fewer threads being created.
Furthermore, as has already been discussed here, there simply isn't as much Xbox-centric news as there is PlayStation or Nintendo news. Xbox is down to a single platform, while PS and Nintendo currently have 2 platforms ont he market. Xbox recieves hardly any news from Japan, while PS and Nintendo platforms have a steady stream of releases.
Big mixture of trying to keep discussion to a single thread for years and a barren period for news. Recipe for disaster.