The Coming Flood of 4E D&D Books

I was listening to the Wizards of the Coast DDXP 2009 Product Announcements on the latest Radio Free Hommlet podcast and the approach that 'everything is core' kind of stuck me. I don't know if I like this approach or not. If every book released and every article from Dragon and Dungeon magazines is considered 'core', I think that puts a lot of pressure on the DM to include EVERTHING in his