Yahtzee finally said what I've been thinking for a while, how being 3D does not exactly enhance platforming. Ever since I played Mario 3D Land and the Jak & Daxter trilogy, I started doubting the appeal of the genre at all, since Jak & Daxter went from platforming to action-adventure as the platformers were in decline and recently Nintendo released this image to cast even more of a doubt:
The sales of 64 and Sunshine compared to the New Super Mario Bros. series don't lie, I am not alone on that. The question is why?
I honestly wouldn't count on 3D platforming being back yet, A Hat in Time and Mario Odyssey have yet to show their merits and if they don't knock it out of the park, the genre just migth go back to sleep. I am not counting on Psychonauts 2, because people play Psychonauts not because of the platforming, but for the characters and humor. And I also wouldn't count Sonic Forces, because there will be voice acting and they keep introducing characters, so I wouldn't count on that game doing this genre any favors.

The sales of 64 and Sunshine compared to the New Super Mario Bros. series don't lie, I am not alone on that. The question is why?
Is that because on a 3D plane, collecting stuff by jumping around seems... weird/trivial? In 2D there is suspension of disbelief as their world lacks a perspective, but in 3D platforming is seen as "casual", since action-adventure games have developed combat and are story-heavy, collecting things and jumping on stuff is not gonna cut it.
I also think that in 2D platforming the fixed perspective allow people to adapt to the controls (since they usually appeal to casuals) and pixelart or hand-drawn styles are visually more appealing than 2.5D.
And finally a visit to the timeline. More or less stared in the PS1/N64 era where they were seen as novelty with potential, then the PS2/Xbox era came and games like GTA and Driver spread around the idea of 3D spaces being packed with content to create worlds (this would later evolve into nowadays' sanboxes) so the idea was starting to fizzle out.
It would hit rock bottom when the Crash, Spyro, Ty, among others stagnated on that time, then Sonic 06 for the next generation that would be the end of the genre for the mainstream. Even if Mario Galaxy hit critical acclaim, the sales of that, compared to the sales of New Super Mario Bros. Wii would signal to Nintendo and others that 2D was back and 3D was out, further emphasized when Banjo-Kazooie developers made a world so big that platforming around would kill the pacing, so they had to fill in with something, hence why Nuts and Bolts is the way it is.
I also think that in 2D platforming the fixed perspective allow people to adapt to the controls (since they usually appeal to casuals) and pixelart or hand-drawn styles are visually more appealing than 2.5D.
And finally a visit to the timeline. More or less stared in the PS1/N64 era where they were seen as novelty with potential, then the PS2/Xbox era came and games like GTA and Driver spread around the idea of 3D spaces being packed with content to create worlds (this would later evolve into nowadays' sanboxes) so the idea was starting to fizzle out.
It would hit rock bottom when the Crash, Spyro, Ty, among others stagnated on that time, then Sonic 06 for the next generation that would be the end of the genre for the mainstream. Even if Mario Galaxy hit critical acclaim, the sales of that, compared to the sales of New Super Mario Bros. Wii would signal to Nintendo and others that 2D was back and 3D was out, further emphasized when Banjo-Kazooie developers made a world so big that platforming around would kill the pacing, so they had to fill in with something, hence why Nuts and Bolts is the way it is.
I honestly wouldn't count on 3D platforming being back yet, A Hat in Time and Mario Odyssey have yet to show their merits and if they don't knock it out of the park, the genre just migth go back to sleep. I am not counting on Psychonauts 2, because people play Psychonauts not because of the platforming, but for the characters and humor. And I also wouldn't count Sonic Forces, because there will be voice acting and they keep introducing characters, so I wouldn't count on that game doing this genre any favors.