I think it all started in Cata when green Jesus really started to rise to power. Rather than having the Alliance and Horde fighting each other while also trying to stop the big baddy, both sides relied on Thrall. Then again in Pandaria, while there was a 'war', it was made into just a way to fuel the big baddy and they really hammered the, 'We must stop fighting each other and work together' shtick.

I don't see WoD ending any differently.