It's all the fault of third party developers. It is a fact that the WiiU is in the same threshold in terms of power to Xbone and PS4, that Nintendo has always catered to the most loyal videogames fans which in return has assured them a big and reliable fanbase to which third party devs can sell a lot their games, third party devs do not need much effort or money to make any port, and that Nintendo fans do not complain at all in regards to gameplay and art direction of third party games, what makes every possible release for said system a release waiting for success but never taken advantage of.
So third party developers are to blame entirely.
Nintendo is selling their IPs to Microsoft and this is true because:
http://gamrconnect.vgchartz.com/thread.php?id=221391&page=1
