While Final Fantasy XIV ARR is doing fine as it is, I think it will help the games longevity and replay value if we could have more content that randomizes itself, such as bosses that wont just repeat the same strategy every time and mix up their attacks, or dungeons that people can go into that change their layout every time they are entered.

Right now, because of how the dungeons are built they basically only get run multiple times because people want to farm for gear so they can then farm for even better gear. The content itself long since ceases to be engaging and soon it just turns into a search for efficiency. To put it bluntly, replay-ability is the pits at the moment and it's going to go the way of SW:TOR unless we get something that can remain engaging after running it two times.