This would take an unbelieveable amount of time, money and people, so....no.
I'm 100% sure it won't happen although it's not like I didn't dream of stuff like that in pretty much every MMO I ever played.

But more immersion is really needed.
More..danger and more rewards to exploration.
I hated it when the antlings killed me on my way from Ul'dah to Gridania, I hated it when I was Lvl 22 and fought a cactuar on lvl 20 which used 1000 needles on me and onehitted me.
But hey, I also enjoyed it, because it made the world feel more dangerous to me.

Monsters running away and following one around - more alive.
In FFXIV, you can already see an incredible love to detail, bring it to the maximum and show us how alive the world can be (like the little frogs in Gridania who only come out in the rain).

Also, reward exploration for god's sake =.=
And when I say reward I don't mean Gil or Equipment.
I mean that if someone takes the effort to crawl up that lvl-80-aggro-monster-infested mountain, at least give him the view of his ingame-life for it and an awesome screenshot location with the whole land laying in front of him instead of surrounding the top with rocks so the adventurer can't see anything.
Don't block off interesting locations like the aether factories with fences.
Put special berries or quests or whatever in remote locations. Even with our gaming culture of showing everything to other players, even when it's not a "secret" quest anymore, it will still be special to get there, still be special because not everyone will want to make the effort to get there.

I really hope they don't forget about the dangers and rewards which make an adventure an adventure when designing the new maps for 2.0, because no matter how beautiful and diverse those new maps are, they will still be boring and bad if they are as lifeless and static as the ones we have now.