This is pure speculation, just a feeling that I have with each piece of information that we get from WoD game. So this is an idea and I would like to see what you guys think of this possible scenario :
our Draenor, known as Outlands, is a ruined planet torn-apart by what Ner'zhul did.(or was it Gul'dan?) the remnants of the Arakkoa civilization are a but a shadow of what their former race was. The Draenei were nearly exterminated and many of them turned fell to demonic corruption, whom we call the broken and the lost ones. The Ogre kingdom is also gone.
The world itself is nearly destroyed. Shadowmoon Valley and Hellfire Peninsula are nothing compared to their origional forms, they're corrupted wastelands. Netherstorm consists of shattered pieces of land and is nearly uninhabitable.
On the other hand we have Draenor, which is like our Azeroth. it's beautiful, filled with life and civilization. Many are going to fall in love with it the minute they set their foot there. They're really putting alot of effort into WoD, and it's a shame to see it gone lorewise after WoD.
The question is, what do you think is gonna happen to Draenor once WoD is over? is it going to disappear? is it going to be closed off and remain isolated? or is it going to merge with our timeline's Draenor? meaning that lore-wise the Bronze Dragonflights are going to cast some type of "big-ass magic" spell and mend our Draenor using the Draenor that Garrosh creates? but since we kill many important warlords in the new Draenor many important Orc characters are going to stay dead even when it merges.