WotC has ALWAYS been good at listening to the fans, and has a reasonable track record of giving them what they want. What some folks don't always get is that ENWorld, RPG.net and several other online sites are not necessarily the majority of D&D players, or even necessarily a good sampling of them. They may or may not be, at any given time.
Remember that what doomed TSR was that they never, EVER gathered any marketing information from their customers/fan base. They published based on concepts of what they 'felt' would be popular, and what their 'guts told them'. That was a large part of how TSR lost money...total disregard for the customer. WotC has a much better history of printing what will sell, and giving customers what they want.
There often seems to be some odd perception that WotC should stop publishing new game material, or releasing updated material, as soon as most people have everything they need to play. It ignores two things: one, that WotC is a publisher, and needs to keep publishing to make money; and two, I LIKE buying new material, as long as it well written. You may disagree with the quality of the new material, of course, but (IMHO) I have only seen one truly bad supplement come out for 3E from WotC (namely the FR module 'Into the Dragon's Lair', I think it was).