Soulcatcher, your comment had me laughing. I just realized, WoTC is doing what the music industry and the film industry have done since the proliferation online/downloadable content (and to some extent piracy). When those industries realized they could not beat online/downloads, they embraced them and built their own distribution networks, or used ITunes to sell their products to people who wanted them.
Since so many D&D games already use house rules, and so many other games are derivative of D&D or based on older forms of D&D (Pathfinder most notably), WoTC realizes they can't stop that so now with D&DNext they will embrace house rules and derivative systems so that they can offer the product and the distribution network for all fantasy roleplaying experiences.
If they can pull it off, it will be a revolution in the RPG market.
(I hope this makes sense. As I wrote it, I found it harder and harder to convey what I really thought...lol)