Irony: There's a hell of a lot of lore ties to Vana'diel in this version of FFXIV than the last version, so technically you're already playing XI-2 in a sense. When you review every story and lore bits as of 2.1, you really wouldn't be surprised if SE states that Hyd. is Vanadiel far in the future.
However, it's more along the lines of:
Bring back meaningful dungeons..something that you could actually explore and have purpose other than hallway a - hallway b and kill boss and leave instance.