Probably farfetched to think but... I'd like time travel moment/element! It would be so cool to visit cities and eras from the past. How I wish I could see Nym in it's prime or see the war between Ul'dah and Sil'dih. Or again relive some moments from 1.0 while being unable to change the future or save anyone but have the knowledge of the future... Imagine visiting Dusk Vigil before the Calamity!
But yes not likely to happen but something I'd love to see!