1. Roy is an extremely overrated Fire Emblem character, especially with better alternatives (the Avatar, Lyndis, and Anna).
2. The inclusion of Miis would be a great idea, especially in terms of customization for appearances (not move-set, though).
3. Vaati is, and has always been, a god-awfully terrible choice for a Zelda character. Tingle is a more approachable character.
4. While the 3DS is irrefutably leaps and bounds superior to the Wii U (in terms of game-play *subject to change*), I do fear the music and stage selections for Smash 3DS will be far weaker than Smash Wii U, because historical precedence dictates home consoles having better selections of such musical and stage inspiration than handheld consoles (i.e. Super Mario 3D Land < Super Mario Galaxy 1 or 2).
5. Toad and Bowser Jr. aren't interesting characters to begin with, and never have been. I'd rather have characters who bring excitement and hype with their move-set potentiality and game-play style - Toad and Bowser Jr. just don't seem, in the very least, appealing to me in this regard.
6. Masahiro Sakurai is not an intentional troll-master. It's just a fictional narrative, fabricated as a coping mechanism for people who want to reduce the stress of otherwise not getting the character reveals or screen shots they wanted.
7. I would not care if Goku is a playable character, if he forever remains the only manga/anime character to be included (no Luffy, Naruto, Ichigo, etc.).
8. Solid Snake (and perhaps Wolf) may very well have the dubious distinction of a character with the worst arguments against inclusion in Super Smash Brothers 4 I have ever bore witness to.
9. Wii Fit Trainer seems to be highly protected by Sakurai within the daily screen shots. In fact, I would even indicate favoritism towards the character.
10. Most importantly:
The term "Nintendo All-Star" is a useless term in context of character inclusions for Super Smash Brothers, as it cannot necessarily apply to all thus-far included characters (Mother characters, Fire Emblem characters, Ice Climbers). Therefore, one should not even bother with the argument.