Blizzard will never do it. It is the final piece to make Paladins the best class in the game and we are not allowed to have fun on Paladins in this game.
I wouldn’t mind this idea. Not sure whether the Humans or Dwarves would be better suited as part of the Lightforged or with Lightforged options for their respective races, but Lightforged High Elves could be interesting and there’s already a lot of crossover for Blood Elves and Draenei as far as aesthetics go so a lot of the Lightforged options would translate well to a Thalassian version.
That’s not to say I don’t approve of adding Human and Dwarf models, I just have some logistical concerns.
humans/dwarves can be given unique features if we think they are vets from the 2nd war like more grizzled appearances, scars with light magic seeping through, maybe a bit more stoic customizations. They wouldn’t appear like regular versions that are young, new adventurers.