Something has come to my thoughts, its blatantly clear with WoD and to an extent with Legion blizzard has been somewhat... lazy, regarding development of the WoW franchise of late, but then WoW isnt the Franchise, Warcraft itself is the franchise of the game.
A thought occured to me that blizzard may onpurposley be slowly leaning away from WoW itself in order to create a new Warcraft game to replace it, Warcraft 4 has been teased many times and they did say almost explicitly in a quote recently that if fan hype for Warcraft 4 was demanding enough they'd make it after SC2 was finished.
I believe this is possibly the case, the reason that WoW is dying, or fading, is because WoW itself is no longer the goal Blizzard wants to focus on in order to continue the actual franchise and as such the quality of its product is slowly becomming less potent in order to fade out WoW itself so that they can generate hype for a sequel to the MMO 'after' creating a new RTS game to build it up again.
It is possible that blizzard could use this to divide their target audience in half with the intention of taking WoW to a more mature level while prepairing for a next generation of players interested in the Warcraft franchise (especially with Warcraft the movie comming).
Think about it: WoW fades out slowly, this lets blizzard work on more mature but casually less content in the wow franchise (it lets them focus entirley on the vanillia fans hence Legion's massive amount of refferences to the old lore) by doing this they can give the old wow vanguard their last big kinda breathe before slowly turning to a DLC like model for WoW itself, making smaller compact expansions as content for the game but nothing on par with a big expansion like Legion.
This makes content itself more deliverable and easier to release, most likley it will be recieved well by fans because it can actually be released with most of its promises in tact.
Meanwhile Warcraft the Movie will create new fans, and for new fans, they need a new game, a fresh game, Warcraft the RTS (Either a HD remake of Warcraft 1 or possibly Warcraft 4 taking place long after WoW).
This will generate hype for a future WoW sequel designed for generation 2 of the wow fans.
Eh, its a shot in the dark but it isnt "impossible" that this is why blizzard is tactically slithering away development from WoW into its other products, possibly, because it simply wants to move onto a new warcraft game in general.