I hope they implement Chocobo's as part of the Grand Companies. Since the Chocobo NPC indicates they are on a shortage and can't just lend them out, I'd expect to see that once you are in certain standings with a Grand Company they should issue you a Chocobo. That would give people something to work towards. I'm talking about completing missions, and increasing the difficulty up to R50+ on Mobs. Then when completed, you are worth your weight in Chocobo. I also feel that the crafting classes should get issued a Chocobo from a Grand Company at a R30-40 quest, as their "Required" travel is way more. Same thing for DoH too.
The Chocobo that is issued should be unique to the type that unlocked it too.
- DoW/DoM should be armored.
- DoH should have carrying sacks
- DoL should have tools and such on it
** A DoH/DoL can't be used for mounted battle, and can only be ridden while in the respective class.
** DoW -- you get the idea

--Onced issued a Chocobo for your respective class, you should be able to call it with "Chocobo Whistle (sure)" and ride it as long as you like. Within certain areas... not in cities.