None of this shit really sells the system anyway, so whatever. If they want to do their 1 game per year for people waving their arms around that doesn't really sell much, so be it.
The Switch doesn't really need a gimmick past it's a "portable high end console". That combination sells the system more than 3D screen or fancy controller gimmicks in the smartphone age where gimmicks don't matter any more.
They don't do BotW numbers, but they still have a profitable audience. If selling 1+ million copies is flopping, then I don't know what should be "successful" to you.
Besides, it's a good thing Nintendo allows their developers to make stuff like Labo and Sushi Striker, even of they aren't huge hits.