How many times are people going to say this? 1.5 million is not a flop. Yeah, it didn't blow up, but it's far from a failure.
For all four maybe. But only one of them sold more than 1 million units (the Toy-Con set). The rest performed horribly. Remember that this was a product Nintendo touted as expending the user base and they heavily advertised. It sold worse than Nintendo's more niche titles like Fire Emblem and Xenoblade
In order to ensure Switch had a killer first year and didn't suffer the Wii U's fate of launching into a protracted drought, Nintendo opened fire with almost all their big first party teams (Zelda team, 3D Mario team, Mario Kart team, Splatoon team, Monolith Soft) in 2017.
The cost of this is that since big games these days take 3 years or more to make, those teams couldn't have another game ready for 2018 or this year. Next year however, is when we should see these teams start to release their second generation Switch games.
That's a good point and it's kind of what I'm thinking. Still, Nintendo has more studios than those that released stuff for 2017. Nonetheless, 2020 could be a huge year for Nintendo.
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Known as Smashchu in a former life