Wind Waker on NGC has had its resale value decreased ever since the Wii U release so I expect the same for TP NGC too.
http://www.ebay.co.uk/sch/i.html?_from=R40&_sacat=0&_nkw=wind waker gamecube&LH_Complete=1&LH_Sold=1&rt=nc&_trksid=p2045573.m1684
Not necessarily. The Wii version of Twilight Princess can be found at a very affordable price, which hasn't prevented the GC version from dunking down in value. Why would the Wii U version do so?










