WoW seems to be going in this direction. WoW has never been an innovative game, they have always been all about learning from other games. They see what works in other games and try to bring it to WoW, they don't always get it right(*cough* transmog ) but they try. I think it just takes them a while to implement some of the dynamic stuff we see in newer games because WoW's engine is a little long in the tooth and not designed to do this kind of stuff. I don't think it is because they don't want to do these things as it just takes longer than games that have an engine built from the ground up with dynamic/scaling content in mind.