It goes both ways
NSMBU was the major launch title for Wii U, basically if you got a Wii U at launch you most likely were going to pick up NSMBU just like most people who bought Switch at launch got BotW. On the other hand, being a launch title means that first week sales are limited by the install base.
Overall it's a good start and the game will have legs.
When the herd loses its way, the shepard must kill the bull that leads them astray.