NES, SNES, N64, GC, Wii. All sold extremely well and were very successful. The switch will be no different. I know they've all be successful because I've never even heard of anything else by Nintendo!
Also, their handhelds have been only amazing and always improve so no need to list those.
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I know this is satire but considering the volume of consoles put out by them and the content that went with it all, this is true from a business standpoint. So PlayStation has 4 consoles and 2 handhelds, and Microsoft has three consoles. And none have failed except maybe the PSP... That was a short-lived handheld. Given the length of time Nintendo has been pumping out games and consoles they are a clear winner in the long term market.