Correct approach to include multiplayer, but the trailer doesn't suggest that it will be as substantial as in Big Brain Academy for Wii. That's a shortcoming.
Much of the decline of the 3DS game had to do with Nintendo giving such titles the token treatment during said generation, combined with the fact that the 3DS and Wii U were offputting consoles to begin with and made such games a very tough sell. Nintendo cared so little a generation ago that the 3DS game got its European release five full years after its Japanese launch and of course the marketing efforts were even more limited than in other regions.
Switch doesn't suffer from the fundemental flaws of the 3DS and Wii U, so there is a basis to bring some IPs back and have them have at least a chance for respectable sales. With fitness and brain returning this year, it's puzzling that sports is still nowhere to be seen.