This. But I'm not gonna even bother to argue with people here about how it would be far more interesting to give players today another limited time opportunity to get a new Black Qiraji Tank mount that is visually very different to the original one and therefore does not trample on original Scarab Lords.
A lot of players would be stoked to grind their ass off in a limited time event to earn their own, rather than Blizzard just throwing a new model at people who haven't done anything to earn it in over 10 years. They have their title, they have their mount. These are new mounts - redesigned, HD. Give players now some opportunity to get it. It doesn't take away from the original ones.
Otherwise I think we should remove the Ret Hidden Artifact skin from Paladins that didn't get Corrupted Ashbringer in the past, and the Mage Tower Marksmanship skin from Hunters that did not get Rhok'delar in the past.