I'm hoping that in ARR either:

A) We'll be able to turn off the Chocobo theme
B) The Chocobo theme will fade out after a while ala FFXI

and my personal favourite:

C) The Chocobo theme will change depending on the area we're in.

If we're on the beaches of La Noscea we get something tropical.

If we're in the forests of the Black Shroud we'll get something calm (maybe something a bit more fast paced).

If we're in an empire controlled area, we'd get something a bit electronic.

If we're cruising around the Deserts of Thanalan we could get something a bit desolate.

I love the Chocobo theme, but I really think that the XIV version is tired. I'd enjoy hearing different iterations of the theme, it's a pretty traditional FF trope to change the Chocobo theme subtly to suit the games theme.