I have yet to hear a good argument that would suggest Skyward Sword is "2 steps backwards, 1 step forward" from Twilight Princess.
Twilight Princess had more difficult dungeons, a more endearing extended cast as well as a fantastic companion, better sidequest rewards (not talking about rupee chests here, but the magic armour ect), more engaging story sections in between dungeons, better motivations for Link, a more explorative world and a more cohesive sense of place, more memorable bosses and greater enemy variety.
Skyward Sword has
better designed dungeons that do not conform the usual Zelda elements, vastly improved cohesion in terms of graphical style, dungeon gameplay outside of dungeons, a better semi-main antagonist, better combat (though lacks the hidden skills), a better (and much more populated) town, a more effective reward system and much better pacing.
I could do the same thing for the rest of the game. What I really want, what I feel Zelda fans need now, is either something that breaks away from all of the conventions. Something like Majora's Mask that takes inspiration from past games, but does entirely its own thing.
Or, sit down, cherry pick the best aspects from each game (and these are obvious) and stick them all together, then spend time massaging it together and polishing it. Skyward Sword's main fault, apart from the story inconsistencies and annoyances, is linearity and a lack of exploration. Honestly, if the three world sections were not cornered off from one another, and were not developed in isolation, the game would not feel nearly as disappointing, despite the other flaws.