The Wii U could make a fairly ok AmigaOS 4.x/MorphOS machine with 2GB ram and a tricore 1.25 GHz PPC cpu (one core untill/when/if multi-core is supported).
From a price Point I Think more people would try AmigaOS 4.x if they could run it on the Wii U, price/preformance ratio can't be compared to low end entry level AOS4.x hardware and if they dont like it their Children can use the Wii U as a gaming system.
This is just me speculating, I got a sam440ep-flex and I would not say no to buying a Wii U for a faster AOS4.x experience at the price of the Wii U and dual boot with MorphOS would rock as replacement to my mac mini.