Super Mario Bros. is a pretty singular example, you're probably talking about the most famous video game series in history. You're can't use that as a barometer for everything and NSMB was inexplicably also the first new 2D Mario game actually starring Mario since 1992. So about 14 years in between.
Most 2D platformers don't do massive business these days.
Wii Fit U flopped just a few years back, Mario Kart 8 is the best selling game on the Wii U I believe by a large margin, it's just limited by a tiny userbase. Wii U sold about 13 million consoles and MK8 sold like 8.5 million copies, meaning the attach ratio there is insanely high.
No small wonder if nobody makes them anymore out of the big companies except Nintendo. And just look how successful the indies are: Shovel Knight, Shantae (though that one has shades of Metroidvania as well) are pretty big sellers for indie titles.
Wii Fit U flopped since everybody thought the Wii U was just a tablet add-on of the Wii and way overpriced for that. Casuals continued to buy the Wii for their fitness instead. Iirc Wii Fit Plus still sold on par to Wii Fit U the year the latter got released, and the Wii was long dead already by that point.
There are plenty of 2D platformers that have been released over the years recently, like Sonic and other IP. SMB is a genre exception in sales, hardly a norm.
Wii Fit was passe and out of style by 2012 largely anyway. Like most fitness fads, people move on after about 3-5 years.
Anyone still doing 8 Minute Abs? About Ab-Doer? Thigh Master? Home Aerobics Tapes? Tae Bo? P90X? Shake Weight? Atkins Diet?
Fitness fads come and go all the time, I think the whole "lose weight playing video games with some plastic shit!" craze largely had its time in the sun.
People have moved on from that. By and large too I think most people really didn't lose much weight from Wii Fit. A few who stuck with it did, but the majority of fat people who bought it probably are still fat today ... and looking for some new fad.
Last edited by Soundwave - on 14 September 2019