IMO they should wait till the NX is released, and do a survey among wiiU backers then wich platform they prefer.
Some other kickstarted indies cancelled PS3 ports in favor of Ps4 ports because the playerbase had overwhelmingly migrated to the Ps4. They offered one on one support for everyone who did not own a Ps4.
I think if they want/have to cancel that is the right way to go about it.










