That's the thing though - what other games did badly, you don't have to bring to wow.
Just like Blizz literally copied Dragonriding from Guild Wars 2 - a very niche game, so they could copy housing from Wildstar or that other game, because it works and it does not suddenly ruin the game - because everything else is still WoW and not GW2/TOG.
Housing in Wildstar or Gryphon in Guild Wars 2 are not the reason these games are either dead or on their last leg.
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Hence I said make it purely cosmetical, because shitty WoW playerbase can't help themselves, so you have to spoonfeed them to ensure it's not being branded as "almost mandatory".