2 gamepads for WII U at a cost

WII U is designed to support only 1 gamepad. But along with its popularity comes a demand for 2. Nintendo is working on making this possible and has posted recently that it is going to be a reality but with a fee. Price is yet to be determined.
The real challenge here is on the frame rates as there is going to be a sure drop in the numbers if it is to have 2 Gamepads. Switching one off is not a solution as it defeats the purpose of having 2. Do you guys think the unit will need an upgrade on another device needed for this to work?
