Ocarina and Majora benefit from having a much more saturated palette and more stylised environments; as well as being made for the 3DS; a console release would definitely have to have more substantial work done. Wind Waker was only suited for being remastered in the manner it was due to its unique style - while it required some higher resolution textures, the vast majority of the geometry was untouched.
And while Twilight Princess with no further alterations doesn't look terrible at higher resolutions, it pales in comparison to Wind Waker and Skyward Sword.
There are variuos inconsistencies with your statements.
First, regarding the 3DS ports and WW not needing to update the models.
The 3DS versions had a more substantial work and time poured into them than WW. The assets were retouched in many departments textures, character models and world geometry. And let's not forget Twilight Princess is a realization of the Ocarina art style in a more capable hardware than the N64. While Majora used most of the assets with some other artistic liberties. Yet here we are with the 2 of them remastered.
Second, your screen caps of SS and WW and how they look vastly superior in high resolution. What exactly are you trying to prove here? We know that heavy stylized games age better. You can say that not just about the high resolution screen shots, but even SD caps of WW and SS stand the test of time better than TP.
Third, what concerns us here. Is that infact TP re rendered at higher resolutions keeping the same assets looks vastly improved in comparison to the GC/Wii versions of the game.
That's the only thing i said. im not even suggesting we will get a TP remaster. Just that you could have a nice looking remaster in TP with the same amount of development resources applied and in a similar time frame to what was used in WW.
Finally, in the case of a potential TP remaster what would be more interesting to me are changes to the game's pacing and amendments to other game aspects such as the rupee management.