Yeah I agree. Cataclysm's revamp was super specific to the context of that expansion, a lot of natural disasters and destruction.
If they did a revamp that focuses on the essence of those areas and their individual stories, include them in max level content, they'd be golden.
People love Azeroth, people love the original races, they like the grounded stories from those zones, they want to see updated capital cities. It's an opportunity to market it as a "wow 2" and capitalize on nostalgia. I'm certain they'll do it at some point, and my guess is it's after Dragonflight.