That is my main concern regarding wow at the moment. That they will pretty much do all they can to skirt around directly addressing the issue between now and March but ultimately only do 1 major patch with Legion so they can keep churning out expansions every 18 months or so. The fact that they are planning to launch Legion with 2 full raids from what I understand(much like how they did with WoD) also sort of adds to my suspicion that this is the new model they have for expansions. I can only hope that 1 major patch would also include new dungeons though I'm not sure I will buy into Legion without them addressing this.