Just checked leveling path.
https://database.turtle-wow.org/?search=boar#npcs:0+2+1
https://wowwiki-archive.fandom.com/wiki/Formulas:Mob_XP
up to 24 lvl it is fine. You just go Durotar then Barrens or Dun Morogh then Loch Modan.
Highest boar level in The Barrens is 16 and in Loch Modan is 17.
They will be gray at 23 and 24 player level respectively.
You can start killing
Tamed Battleboar in RFK. His highest level is 26. It will be grey at 34 player level.
Then you go killing
Withered Battle Boar with 34 lvl until player hit lvl 43.
Then you settle down in Blasted Lands and kill
Ashmane Boar with level 48-49 up to player level 60.
You also have an option to kill
Helboar of level 52-53.
I see two difficulties on this path: requirement to level in dungeons(RFK/RFD) from 24 to 43. And Blasted Lands will become bottleneck, where boars are also source of high level consumables.
Is there any minimum level requirement for this? I assume it is 1, but who knows.
Will you guys disable stop xp with UI menu when this go live?