It's assumptions like this that are driving logical discussion off the deep end here. Nintendo has more than a few very good American lawyers, and unless these contracts are being drafted in Liturgical Greek, there's really very little for those hidden clauses to hide behind.
Also, there's the assumption of EA not making games for a Nintendo platform. If EA doesn't make games for the WiiU, their stockholders are gonna have them by the throat, especially after the success of the Wii. Nintendo isn't desperate for EA's support. Nintendo makes tons of money without EA's spin-off sports games selling much, and did perfectly fine when Mirror's Edge, Dead Space, Mass Effect, and Battlefield all missed the Nintendo platform. I don't think I own a single EA 3rd party Wii game, even though my 3rd to 1st party ratio is well above 2:1. Nintendo doesn't need EA to thrive, and EA not putting their sports games on the WiiU is out of the question thanks to stockholders, so I really don't get how people can even imply that Nintendo needs EA when EA provides such a minuscule portion of Wii 3rd party sales. It just doesn't make any logical sense.