EDIT: This thread is more of a "I wish Mario 3DS and Zelda SS were flops, because I don't like the direction the series is going and I want them to return to the SMB and Z1 gameplay upon this failing."
--
http://www.gametrailers.com/video/gdc-11-zelda-skyward/711140
http://static.arstechnica.net/assets/2011/03/nintendo_gdc_intro-thumb-640xauto-19924.jpg
Disclaimers: Yes I am judging immediately from very limited screenshots/video, and flop means in financial expectations of Nintendo not that it won't sell a million.
Mario 3DS
Look at the screenshot. Particularly the left edge of the lower left image. It's the edge of a floating platform. Also the ? block. It's reusing art assets from Galaxy/Galaxy 2.
It's Super Mario Galaxy 3.
Due to this and being in the same position as Super Mario 64 DS (3D Mario near launch), I think it will sell less than either of SMG2 and SM64DS and be the weakest selling main Mario game ever. From what I can see it has nothing to attract new people to Mario if they didn't already like Galaxy; it doesn't look like a coherent Mushroom Kingdom and looks like a linear series of arbitrary platforming challenges (contrast Mario 64's large worlds to explore).
Zelda SS
The art style and music are surprisingly similar to Galaxy to me. It retains the Ocarina gameplay style (puzzles and enemies acting as puzzles) and the swordfighting didn't look very immersive on the trailer (as in 1:1). So it is an Ocarina sequel in a long line of Ocarina sequels that brings nothing new and nothing to attract casual players.
It doesn't retain Twilight Princess's advantage of being the only good launch game, so I would like to compare it to Majora's Mask. I think it will sell less than that lifetime (<3.36m per VGC).
