I agree and disagree.
I agree, but not because it will be hard to find the accessory. I agree, because Nintendo really needs to promote this asymmetrical game design, which is actually going to take awhile to wrap developers heads around. I mean look at Nintendo Land...it has two games that are basically the same already using asymmetrical design. This makes me think, that although there is potential, it is not nearly as big of a deal as say motion controls with the Wii.
However, I disagree, because some of the more innovative and useful functions of the screen will not be focused on this generation. Sports games can become more strategic, and engaging creating a game experience where the player can literally be the coach on the fly calling plays in real time, and changing formations quickly and easily. Even managing player fatigue and substitutions all while still playing the game real time. And this is a really sad potential that will not be out on the Wii Us first sports games, that should.
Nintendo, should have the development tools and solution already in place for two gamepad controls now. I think what will really happen is that this Gamepad isn't going to see its true potential in game design until a year or two in...and many developers will just see it as a gimmick that doesn't add anything new to the gaming experience. However, I believe the potential could have been more realized with two Gamepads being used at the same time.
We will have to see what happens...but I feel this will be Nintendo's mistake with the Wii U...it isn't a very big mistake and it will be fixed later on, but I feel like the Wii's controller should have been motion+ from the very beginning...the WiiU should of had full two controller support from the very beginning.