Maybe one day though.
http://www.nintendoworldreport.com/news/37899/miyamoto-not-the-time-for-dual-gamepad-experiences
The famed game designer Shigeru Miyamoto believes dual Wii U GamePad experiences are possible, but aren't likely to happen at this point in time.
In an interview with IGN, Miyamoto stated, "Certainly as we've been working on Wii U, I think we're at a point where we don't feel it's realistic to expect people to purchase two GamePads yet. We're still trying to get as many people as possible to buy the system itself, and that's where our focus is right now. For the time being, two GamePad gameplay is not within our objectives in the short-term.
"From a technical standpoint, I think if we decided to pursue that, technically we would be able to, and we can perform system updates that would allow for that. It's also very interesting from a gameplay perspective idea because there are a lot of possibilities with two GamePads. But, at the same time, taking that kind of approach would again be a drain on resources and require us to continue to utilize our development resources for that. So then it would become a question of where do we want to devote our resources: Is it to creating regular GamePad games, or creating games centered around two GamePads?"
The possibilities of two GamePads have been discussed multiple times by Nintendo. That discussion went as far as giving the controller a dedicated price on the Japanese website. No further announcements were ever made.
When Reggie said we would be able to use 2 Gamepads a couple E3's ago I knew it was just a talking point the settle the angry masses.
The screen is the most expensive part. The rest of the GamePad uses fairly cheap parts. I've seen bananas with high quality cameras. According to an article I'm too lazy to dig up again, the parts for the GamePad cost about $80 at launch (not counting manufacturing). In 2014, that amount has only gone down so even if Nintendo insisted on making a small profit, they could get the price down to something reasonable.$80 is the cost of a Gamepad to actually buy it last I checked. If we go by that account then Dual Shock 4 and the XBox One Controllers should easily be half the price there charging.
Streaming to two GamePads apparently cut the framerate in half. It's feasible, but if a game isn't already running at 60 frames per second, it isn't worth it.
The screen is the most expensive part. The rest of the GamePad uses fairly cheap parts. I've seen bananas with high quality cameras. According to an article I'm too lazy to dig up again, the parts for the GamePad cost about $80 at launch (not counting manufacturing). In 2014, that amount has only gone down so even if Nintendo insisted on making a small profit, they could get the price down to something reasonable.
Streaming to two GamePads apparently cut the framerate in half. It's feasible, but if a game isn't already running at 60 frames per second, it isn't worth it.