Almost, there's still two exclusives worth playing and Super Mario 3D World is the best 3D Mario, infact, I'd likely call it the best 3D platformer of all time. However, as soon as these games are ported over to the Switch which is almost guaranteed to happen, then yeah, there literally is no redeeming value. The Vita is a close second, same as Wii U, nearly everything on the system can be played elsewhere.
However unlike a lot of people here, I'm not so much of a collector that I've purchased any of the lesser known consoles. Pretty much only have owned consoles from Atari, Nintendo, Sega, Sony, and Microsoft. The only stuff not from these that I've ever emulated are the Turbo Grafx consoles. I'd collect for the games I'm interested in for that, but the games I'm interested for that are pretty expensive, so nope.