My Prediction; EA will drop support for the Xbox ONE and re-up support for the Wii U.

[ToxicJosh]

EA won't stop supporting Xbox, because Microsoft won't stop paying them to support it.

If its sales drop to Wii U like levels then I doubt it'll get any more exclusives, but the support will 100% remain.

Conversely, I think EA will see what sort of HW bump the Wii U receives from Mario Kart 8, and if it is significant enough (ie. 7 figures, with a long tail) then EA may well put out a port or two to test the waters. But I doubt it.