I don't understand the notion that first person is not good for an RPG. It is perfect for RPG and role playing in overall, because only then I can get the feeling that I'm actually "there" in the gameworld. When I see my character's back all the time, there's this disconnection: I am not Geralt, for example, I only tell him what to do (isometric view is a totally different animal and not relevant right now). Even melee combat, when done right, is better in first person. I got used to the third person view and don't mind it that much in games that offer only that mode, but I still prefer FPP - I was so overjoyed when GTAV got the option of this kind of perspective, because only then the game became actually... immersive.
I remember it was Divinity 2 where if you looked up, the camera got so close to the character model, it became first person. Whenever that happened, the only thing I could think of was how awesome it would be if the whole game was FPP... Another example of a third person game where things didn't really work right, was one of the early Tomb Raiders. When looking up... Lara's model became translucent so you could actually see what's up :D
And to all the people who say adding TPP to a game is an easy task, here's an example. It's the other way around, but it's pretty much the same thing: the GTAV devs said in at least one interview that adding first person perspective was a very hard task. Hundreds, if not thousands of animations had to be redone from scratch, new viewmodels had to be created and it cost them a lot of time to do. It's not just moving the camera closer or further away, unless you don't care how things look.
I do not think CDP will add TPP in the foreseeable future. Maybe in some "director's cut edition", but the whole discussion about all this will most likely die out by the time the game is out.