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Beloren -- if you recall, I've been a huge supporter of this, and I think it should have been done a long time ago. Blizzard may not realise it, but people are more into their races in this game than any other game. It is one of their strongest assets.
When you look at forum discussions, issues, complaints, you have gameplay ones, but the story , state, discussion of the races is one of the biggest topics of interest, excitement, fan generation. Sub-races and allied races are hugely popular because of this- and yet for such a creative bunch, whoever is driving the direction of wow, has had a big blindspot on this area.
I hung heads with @
Mace on this did something similar to this a while ago - based on some ideas he had presented in the past, but instead based it on a capital rebuilding system thing. Which would have an element tie into current player progression that would advance the racials of the character in addition to class abilities (at least for the expansion it was introduced in, though it could carry on into the future ones)
Class abilities would be racially themed too.
But there would also be a vehicle for the source of the improvements... and these would be also racially themed based on the race's lore.
for e.g. Blood elves would have the Sunwell - light side, Sunwell - arcane side and something like the Nether storm conduit or blood gem or fel crystal that would serve as the source of their power. Just like Artefact weapons had new extensions later on in Legion and Azerite necklace had improved features too... the opening part would start with the Blood elves' Sunwell Light side, then a subsequent patch you will unlock things on the arcane side, and a subsequent patch would involve the Netherstorm.
The idea is to tap into the things that represent the race.
Draenei would have the Atamal crystals - they could 3 crystals for progression, or switch to the Naaru for the second one
Dwarves would have 3 titan paths. Kazgorath, Golganneth and Aman'thul
Night elves would have the Well of Eternity (arcane), Nordrassil or Shaladrassil (nature/Emerald dream), Font of Elune - as the 3 key racial items.
Part of the early quests concerning the capitals is linking your race to their sources of power or inspiration.
Here are some of the topics I can recall this was discussed in detail.
https://www.mmo-champion.com/threads...ral-expansions
https://www.mmo-champion.com/threads...-in-one-stroke
https://www.mmo-champion.com/threads...-of-a-lot-more
So I would expand some of your selections above to make sure key elements of each race have some expression to the things they are really good at: In the lore, certain races have an extensive involvement and interaction around certain key classes and disciplines
Humans: Warriors, Priests, Mages, Paladins
Night elves: Priests (incl wardens & Sentinels), Mages, Druids
Blood elves: Mages, Paladins, Hunters
Tauren: Shaman, Hunters, Warriors
Orcs: Warriors, Hunters, Shaman, Locks
Some races have 1, some 2, some 3, some 4 - but they have extensive lore tied to those elements and should have things reflecting that.