When will Wii U owners be satisfied enough to accept a new console?

[zorg1000]

Soundwave said:

Once Zelda U is finished, I think Nintendo is pretty much finished with the platform.

I think maaaaaybe Retro Studios might be doing something like Diddy Kong Racing U as the swan song in 2016.

By that time though Nintendo will have given the Wii U all the major Nintendo IP. There's no point in dragging out an unsuccessful console. It just hurts the company by devoting resources into a dead end.

The GameCube really didn't get 5 years either, Nintendo pretty much stopped supporting it after March 2005 with DK: Jungle Beat's release. The rest of the major games were basically outsourced projects and Zelda: TP was moved to be a Wii launch title with the GCN only getting a limited, late release of the game. 

For N64/GC/Wii 1st party support pretty much dried up after the 4th full year.

In 2001 N64 pretty much just had Pokemon Stadium & Paper Mario

In 2006 GC pretty much just had the cross-gen Twilight Princess

In 2011 Wii pretty much just had Skyward Sword & Return to Dreamland, 2012 just had the way too long to localize Xenoblade Chronicles.

Why not just axe the 5th/6th year which never get much love and release the new console at the end of the 4th year?