The current console market is fully consumed by the Sony PlayStation 4 and Microsoft Xbox One devices, though many often overlook Nintendo's Wii U. It's true that there are similarities in the game catalogs for both the PS4 and Xbox One, but that's because game developers want their titles on the two more popular consoles.
Here is what Nintendo of America President Reggie Fils-Aime said: "If you look at the other two competitive platforms, fundamentally, what's the difference? They have a lot of shared content. Look at it from the standpoint of, what don't they have? They don't have our games. They don't have Mario and Zelda. I'd much rather be where Nintendo is, with a differentiated platform, differentiated set-up experiences that we can provide uniquely to the consumer."
It's true that the PS4 and Xbox One don't have Mario or Zelda - but a counter to that argument is that many game studios would rather develop games for Sony and Microsoft. Nintendo relies heavily on a small handful of game franchises, while the PS4 and Xbox One can provide a diversified product offering.