Honestly- him not being seen as a viable option would, statistically, bode well for him, considering none of the characters that got into pass one were a 'viable option.'
- I never saw this considered by a single person. The most legitimate WTF character, moreso than Wii Fit Trainer.
- Not on Nintendo. Not viable.
- Perhaps the most requested of the bunch, but ignored in English speaking countries.
- Microsoft would never get in. And if they did they'd put someone else first.
- Not on the radar.
- We wouldn't have another FE character.
I would not rule out a number of other characters.
Steve (Mii+ costume perfection, IMO); Scorpion (It's a fighting game, and Mortal Kombat as a media series is only surpassed in sales by Street Fighter);
well, I could go on, but I think these are the primary holders that come to mind right off the top. Oh- and Spyro. It depends how much his legacy is actually considered to have lived on in Skylanders.
I legitimately cannot imagine a world where this is possible. HIs most iconic move- if a special- would be his default move. Wompa Fruit bazooka... may not even get into the game.