They've left the Wii U to die.

[Shackkobe]

Wii U is an underpowered console.

That is pretty much it's only flaw. If Nintendo had invested more into the CPU, GPU and RAM, we would be singing a different tune right now.

And as such, the Wii U will need to have a shorted lifespan as it's hardware is simply too dated. It can't keep up.