"Overt" (for the lack of a better word) amount of content isn't a problem when gameplay and systems are also designed to take that into account.
What kinda worries me, is that the progression system gets stale before the game is half way through. And with that the whole gameplay gets a hit for the worse. One of the markings of a good open world RPG is that it makes the player "want to" keep playing to get better; and to get better so that he can tackle that one thing (enemy, puzzle, dungeon, mission, what ever...) that bested him. I'm not really seeing that being the case here; from what we know of the things that are involved. I might be wrong, but....
What kinda worries me, is that the progression system gets stale before the game is half way through. And with that the whole gameplay gets a hit for the worse. One of the markings of a good open world RPG is that it makes the player "want to" keep playing to get better; and to get better so that he can tackle that one thing (enemy, puzzle, dungeon, mission, what ever...) that bested him. I'm not really seeing that being the case here; from what we know of the things that are involved. I might be wrong, but....