@OP - The Nintendo home console life cycle is normally 5-6 years. N64 in 1996, GameCube came out in 2001, Wii in 2006, Wii U in 2012.
Your thought of Nintendo ending the Wii U early, in 2017-2018 would actually be normal length for them.
The Carnival of Shadows - Folk Punk from Asbury Park, New Jersey
http://www.thecarnivalofshadows.com