I said it should happen, not that it will.
Madden with 2 gamepad support was one of the original thoughts to be a showcase for the feature back when we thought EA was going to be showing "unprecedented support".
I'm not expecting Nintendo to actually have this in the works for next year, but I would assume that are always actively trying to improve 3rd party relations, and not having any EA sports games and any of their other major franchises really doesn't help when the console is already struggling to get a foothold with current gen gamers looking to upgrade.
With Madden leading the way on promoting dual pad support to the masses, it will be easy to understand the benefits of such a feature almost immediately, and that's half the hard part of selling such a feature, getting people to understand why they want it.