It depends on the expansion for me. Something like BFA can make sense, as your character would’ve been conscripted to fight in the war as they needed as many able bodies as possible (if you look past that they forget members like the Stonemaul Clan).
With Shadowlands, it doesn’t make quite as much sense. The world (of Warcraft!) is being decimated by the undead, with your only hope is to send your best hero into the afterlife to save the day!..and you opt to pick some newbie who can barely pick up a weapon and beat up an agitated rat, all while calling them champion and savior. Doesn’t really quite flow well, in my opinion.
Thus is a reason I feel like an old world revamp would be better in the grand scheme of things. It puts players in a more familiar territory, it would feel more Warcraft-like, gives new players a chance to be called a hero, and putting that area as the starting area for new player saves resources in having to change out the starting expansion every time you make a new one.
Seems to make more sense to me, at least analyzing it from the outside. I can’t say what the internal planning process is, of course.
It’s among several different rumors of what could come next, with nothing really being set in stone. Off the top of my head, I’ve seen the following:
Eastern Kingdoms and Kalimdor revamps
Dragon Isles
A return to Pandaria
Light & Void themed
It’s unclear what direction the next expansion will take us. I’ll at least be content if the setting is better than the afterlife, though some new races people have been wanting would also help a lot.
I’m for Forest Trolls, myself. They and Ogres are some of the missing members of the since the Warcraft RTS days. The Horde has allies with the Revantusk tribe, who are interested in reuniting all the Forest Troll tribes. That would make for a fun storyline and unlock scenario for them as a playable Horde race.
Since you like Forest Trolls, I want to send you to the Forest Troll megathread. It was made by Zurogrusel, a really cool person on the forum that I haven’t seen in a long time sadly. They might have quit at the time of this post, in which that “more customizations during Shadowlands” promise was broken and caused a number of people to quit, but I want their work to continue to be supported since I feel Forest Trolls are an important race to add.
You can find the Forest Troll megathread here:
I’m also of the opinion that making all members of both Horde and Alliance in some way and adding a few specific races would make them feel complete and also feel like they’re both evolving as a faction. It would go a long way in making the game feel really amazing in terms of world building!
Dream big, Ogre fans! 
