The argument that it didn't sell that well as:
"People didn't buy it on the Wii U because already bought it a year ago on their PS3/360"
can easily be turned into:
"People will just buy it on their PS3/360, if we don't have a Wii U version."
I don't think current software sales of games released on the same day would indicate it's substantial or valuable enough to care right now for EA anyway.
They may not "outright bomb" but they may not have as stellar sales as you're implying they will simply because of their pedigree. They also may not have the intended effect of driving HW as much as one would hope.
Take two recent examples, just using Japanese figures as they're more documented:
and
Brain Age:
Red = Brain Age
Blue = Brain Age 2
Green = Brain Age 3DS
The latter grew substantially from iteration to iteration on the NDS, but neither transitioned that audience to the 3DS very well. And neither did a great job at driving HW.