Ah, okay, thanks! I think it is fits into the line of decisions what makes sense from a purely business standpoint but controversial at best from a fan standpoint.
People always quick to defend WotC's recent policy on not making CGs with pointing to the older material as "Why do stuff that is already done? It's out there." Bu I think this is a kind of 22's catch, because if you aren't an existing fan, you probably won't know about the older material. If they're writing CoS, for example, or a Planescape adventure as the older material isn't existing, don't mentioning it in the adventure, changing the settings in the adventures and don't even pointing toward DMs'G, then how a new fan supposed to came into contact with the existing material?
I think it is a passive way to slowly withering away the settings and making room for their future vision of the D&D multiverse, which is FR, or more accurately Sword Coast and everything is just a minor, complementary thing.
That means bye-bye RL, or Dark Sun, or Eberron, or DL, etc.
Now I understand how that's entirely inconsequential to someone who didn't care about those settings, or to a newcomer, to whom this version will be the default. That doesn't mean I have to like it, or applauding they're doing this.
On the plus side, as i said in the other thread, if they manage to achieve the whole transmedia thing, and following this path, that could mean I'm losing interest in D&D, but if that brings in more new people, that means more potential people who might later switch to other companies products, which companies want to do a rpg primarily and do fully supported settings.