Which Nintendo home console had the worst twilight years (post SNES)?

[TheMisterManGuy]

Salnax said:

How exactly are we defining "Twilight Years?" The last 2 years before a successor launches and any support afterwards?

Basically the last two years of a console where we already know the existence of the next one. Whether that be a formal unveiling or constant rumors of something already announced. For example, we knew a little about the Wii U in 2011 before it's official reveal via leaks and rumors. And the NX was announced in 2015 by Nintendo, so much of the Wii U's remaining life was just speculating about the NX.