Actually as much as I love the series I sort of agree. I was trying to explain to my woman last night while playing the OG 64 game on the Wii U why it's paper (she thinks the concept is pretty stupid) and I was really struggling. I basically had to say it was neat from a technical standpoint 15 years ago but, really, it's not 15 years ago now, so what's the point?
Now, Super Paper Mario and Sticker Star used the paper esthetic, as a critical gameplay element for the former and conceptually for the world of the latter, but all y'all hate those games, so what's the point in continuing the paper thing?
I think people will like the gameplay aspect. I mean look at South Park Stick of Truth. It was the closest you could ever get to a Paper Mario clone in terms of gameplay and people generally loved it or were ok with it.
As for me, I REALLY hope the series will continue on from TTYD. I thought SPM was alright, but not worth returning back to. And please, no Miyamoto meddling or anything like Sticker Star.