WiiU doesn't need to be as powerful for PS4/720 anymore than Wii or DS needed to match PS360/PSP.
WiiU however either needs a good hook (like the wiimote or a dual screen back when it was novel on DS) or a lower price. Right now it has neither. It's in the same boat as 3DS when it launched.
While WiiU is a loss leader, MS/Sony systems will also be and they'll take a greater loss. WiiU's price is inflated due to the cost of the Gamepad, meaning despite the PS4/720 having much better tech, they may not be more expensive or not much more expensive. MS also has it's 2yr XBL subscription model to reduce the price so with that it's possible the 720 will be as cheap, if not cheaper than WiiU when it launches.







