In a further argument of what I mentioned before I think these ultimatums happen all the time. Developers quite often say "well we might develop ____ if ____ does well" such as Bandai talking about bringing over more Tales games if the ones that they have localized so far do well enough.
This seems like the same thing, Ubisoft has obviously put in some effort into growing the WiiU userbase but they've put in as much as they are willing to to try to help it out, and now they think Nintendo has to take some losses in order to help things out.
Doesn't seem much different to me from Aonuma's recent statement that he'll be watching how Hyrule Warriors does to see if putting a playable female character in a mainline Zelda would be worth the effort.
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