You need conflict for a story to be interesting, so the faction divide stays. That said, it doesn’t need to be a hot war in story terms. There is an opportunity to play on internal faction politics. The Alliance is predisposed to peace and order: so give them a mad king. The Horde is predisposed to strife and chaos: so play up divisions within its ruling council.
Good question, been wondering that myself since Pandaria. Yet we still got BFA 
Woot! /s
In all honesty, I think Blizzard likes the idea of factions still and doesn’t want to rid of them. But they haven’t found a way to breath new life in said faction war that actually makes sense. Not to mention after BFA, majority of the players are just done with factions all together for the most part.
Funny enough, the war between the two factions has been largely a quaint side story for the vast majority of this game’s history.
Vanilla: had some fighting over land (arathi, warsong, alterac), but mostly the fighting was against Ragnaros, the Black Dragon Flight, and the silithid.
BC: Had some minor fighting over some zones for resources, but again the major fight was against Illidan and his underlings.
LK: Fighting between factions almost entirely forgotten in order to fight against the Lich King
Cata: Wait, factions are a thing? Must defeat big evil dragon who wants to kill us all.
MoP: Hey, let’s start up a faction war over this new land. Haha just kidding, let’s kill some gods who want to kill us all.
WoD: Alternate reality gobbledygook blah blah blah defeat the Iron Horde
Legion: Factions still mostly forgotten as we defeat the Legion.
BfA: Oh hey, remember that faction war that has been mostly ignored for many years? Let’s suddenly bring that back to the forefront in the weakest plot this game has ever seen.
SL: Aaaaaaaaand factions quickly forgotten again as we all face eternal annihilation of our souls. Or something. Oh yeah, anima. We all hate anima. Anima is the real enemy.
Because it’s fun.
Combine the factions but kick out gnomes. All out war on gnomes!!!
You seem to have missed the part where Baine and Thrall sold us out to the Alliance for the sake of “honor.”
The faction conflict persists because Blizzard is afraid to let it go. It’s literally never been important from a narrative standpoint in WoW. When it shows up, it’s forced and doesn’t make sense. Azeroth is a world under the threat of death every other year, canonically. And almost every time, both factions work together to save things. There shouldn’t be TIME to be at each others’ throats.
The faction war can’t be over, we haven’t finished killing all the Horde yet.
Their corpses deserve to be delivered to the Light.
Night Elves are Night Elves, you even let the Highborne Night Elf mages back into your tree.
As someone who has played both factions about equally, I like the faction divide. Although I do wish we could make premade groups for PvE and maybe even neutral guilds. As PCs we can be the exception but your average Human or Orc will likely keep their prejudices.
Oh no, I don’t want to do anything with the faction divide. Give us neutral guilds/groups, though, and I’d be pretty much golden.
(Although defections might be cool!)
It’s just a public relations thing. Out back everyone’s drinking and playing toss the gnome/goblin…hic!
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The faction war will continue because the night elves just lost their home, the Gilnean lost their home TWICE! For the first time I believe the war will continue because the alliance will not accept the horde as an equal. The alliance suffered a huge loss recently and it wasn’t only Sylvanas there. At least half of the alliance will not want peace and really… shouldn’t imo. I’d be bummed if Tyrande and Genn were like… “oh yeah Anduin your right! We can’t keep fighting the horde! That was just Sylvanas’s fault!” 
lol
Especially the night elves!
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I remember the cold war and the race to the moon…you know, the one that gave us home computers?
That’s right, without the space race we still wouldn’t have home computers, much less the internet and smartphones. Computers would still be room-sized slow IBM mainframes. The internet would still be a toy somebody in Switzerland used. Telephones would be landlines, like 1920-1980.
The moon race created minicomputers – they couldn’t fit the big ones in a spacecraft, and they couldn’t fly a spacecraft without a computer.
Do trolls drink beer? Let’s find out! Help me (oof) get this stupid (ouch) helmet off!
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