I've been playing Super Mario, Zelda, Metroid, Mario Kart, etc. for 20+ years. Give me something else. And before someone says "but you're up to FFXV and MGS is like the 12th title in the series", Those games (and other non-Nintendo long running franchises) have had a different story and different mechanics in pretty much every game. That's enough to grab me. Hopping on goombas to get to a castle that doesn't have the princess for 20 years isn't comparable. Saving Princess Zelda from Ganon by dungeon crawling and breaking pots isn't comparable. So on and so forth.
As long as the biggest reason to get a Nintendo console is another Mario Kart or a Zelda, then no thank you. Only way, at this point, I would get a Nintendo console is if they came up with some new IPs; or if Sony or Microsoft got the Nintendo treatment from 3rd parties, and all that support went to Nintendo. Neither seems to be happening in the near future and games like X (you know, things that are genuinely interesting) are so few and far between that a Nintendo console would be a dust collector. People hated that term used about the Wii....but it was true for that console, it seems to be true for the WiiU, and until 3rd party support picks up and new IPs are made, the same will be true for any future Nintendo console