It's not just the RPGs getting thinner, I think the Mario series over the past few years is experiencing downtime where we're just not seeing as many Mario games. This year alone we have, what, Super Mario Maker 2, the upcoming Luigi's Mansion 3, upcoming Mario & Sonic game, a few atrociously standard mobile free to play "games"? And practically nothing from this year's subpar, disappointing E3 (E3, however, has also been on steady decline, and this year's E3 has been a disaster for security with ESA accidentally doxxing attendees, this is another topic, though). A lot spinoffs I feel haven't seen a new game in years like full fledged Mario Golf (though if Golden Sun comes first, that's fair game since Camelot hasn't made one of those in forever and the last one is disappointing I hear), Mario Baseball, Mario Strikers, Mario Kart. Again, the Mario spinoffs I know are on Switch barring Wii U ports are Kingdom Battle, Tennis Aces, Super Mario Party, Luigi's Mansion, and the Olympics. Not even Mario vs Donkey Kong? Not a whole lot when it comes to Mario. I should probably give some time, maybe, but I note the line up is pretty similar to Wii U barring Mansion and Kingdom Battle, and Wii U had Captain Toad and Mario Kart and Mario vs Donkey Kong.