This largely depends on whether Blizzard ever has the stones to have another faction war in the story (which they seem to be reluctant to do anymore given past receptions), and also have the stones to let the Alliance be the aggressive party for a change.
They have all the ingredients for the recipe:
Turalyon would like Lordaeron reclaimed for the Alliance.
Alleria and…what’s his name? Umbral? Have both said they’d like Silvermoon “brought back into the fold”.
Genn clearly wants revenge.
Night elves wanting some retribution isn’t all that far-fetched.
There are a lot of characters such as Rogers who’d be glad to have some blood for blood action.
It will never happen though because Blizzard has no guts when it comes to making Alliance the aggressive party. They’ve had countless opportunities in the past to go that route and they’ve consistently regressed to the “Bad Horde go BRRRR” cliche’. Besides that they’re also veering away bit by bit from factions being hostile to each other.
So the best you can hope for is the occasional Horde NPC dialogue where they say “Remember that time we did that bad thing? Yeah that sucked, maybe we shouldn’t do that anymore”. I can handle some of these to touch on the lore and show the Horde is changing for the better, and then they do it.
After they’ve covered it then they should put it to rest and move on.