1. It's the only 3D Zelda left to be remastered
2. It has NOT been offered either as a Wii eShop game or Nintendo Select. More Wii Nintendo selects are very unlikely. If there's no budget re-release planned, something else could be on the horizon.
3. Nintendo routinely delivers new Zelda games (including spinoffs, portable games, and remasters) as often as they can provide them. Since 2011, we get one or two at a time every 6 months/other year
4. You have to figure they nearly considered delaying Skyward Sword to be WiiU launch title. It wouldn't be surprising if they had HD assets for this game already.
5. Because Zelda amiibo sell really well
6. Aonuma said "it's definitely possible". Did he ever address possibilities Majoras Mask 3d or Twilight Princess HD as directly? No.
Bonus: As a rather refined motion controlled game, it could be a really great VR title.
I predict NX launches in 2017 - not 2016