I would actually play a 3D Mario game styled like this if Nintendo could actually bother doing something right for a change.
Hell, if Nintendo could take the aesthetics they've shown off from the Zelda Wii U game and apply it to a 3D Mario, I'd even settle for that. Practically all the 3D Mario games lack detailed and interesting environments, they're always too..."cartoon-y", or rather they use cartoon-styled aesthetics to substitute the need for immense "detail", I guess? Which is nice when you want to be lazy and shit out some shoddy looking game, but c'mon Nintendo, it's 2015, at least pretend for a while you're not still stuck in 2005.