Personally for Nintendo games, I'd be OK with 1 TFLOP or so. Even though it's disappointing performance for 2017 (lol Nintendo), it'd be able to run a game like Zelda: BoTW at a rock solid 1080P with 3x-4x greater graphical fidelity.
I mean for the games Nintendo likes to make ... at least for their own stuff, likely they won't even able to make many games that use even that much horsepower.
Nintendo is never going to greenlight a Metroid game that would have like a $50+ million dollar budget anyway.
Their cartoony franchises which is like 90% of their roster like Mario, Kirby, Yoshi, Donkey Kong, Pokemon, Pikmin, Mario Kart, Mario Party, Splatoon, Animal Crossing, etc. will look great even at 1 TFLOP.