Seeing Wii Fit Trainer getting chosen actually boosts my confidence for Robin quite a bit. Wii Fit Trainer is the character nobody knew they wanted, and I think Robin has the potential to be the same.
For Sakurai, it seems clear that his top priority for roster selections is having characters that make people interested in playing Smash. Usually, this translates to popularity and diversity.
Honestly, I don't think Chrom qualifies as either of these: he's "popular" in the sense that he's the face of FE:A, but I don't see him as popular enough to convince someone who didn't already care about Marth to pick up Smash 4. In other words, I see him as the character that most people recognize, but ultimately will not care about.
With Rosalina, you have a paired up asymmetrical playstyle. With Little Mac, you have armored rushdown. Chrom wouldn't be able to differentiate himself from Marth/Ike without going through an image problem. Sure, he can class change, but Chrom isn't really associated with class changing. Sure, he can pair up, but as I said in my earlier post, pairing Chrom up comes off as strange because he's supposed a fighter, unlike Ice Climbers/Rosalina/Olimar.
I find being pessimistic about Chrom helps me to be optimistic about Robin. heh
I absolutely agree with this. Not to hate on Chrom or anything (although, hating on Chrom = hating on Robin's main competition = supporting Robin, so...), but while he is undeniably the face of Fire Emblem Awakening... is that really such a huge advantage for him? Granted, that definitely is one of his selling points, and Fire Emblem fans will no doubt recognize him... but what about those completely unfamiliar with Fire Emblem? To use my own experience as an example, I never really got into Fire Emblem before a couple of years ago. When I played through Melee and Brawl, I didn't know really anything about these Fire Emblem characters, apart from the fact that they apparently used a lot of swords where they came from (their symbol is a sword, for crying out loud...). I became familiar with Marth as he appeared in both games, and after awhile I knew Ike as the latest protagonist of the series, but I was not at all interested in the series based on the roster selection, nor did I particularly care about it in any way.
It wasn't until I started doing some SSB4 roster prediction stuff years ago did I feel obligated to research Fire Emblem to see what would make for good character representation. For that, I looked into several videos of Radiant Dawn to get an idea of what the main characters of that game were like and what they did. While I was doing that, I became rather fascinated by the strategic element the games provided, and as a sucker for RPGs, I proceeded to buy Radiant Dawn as my first Fire Emblem game, and loved it. Naturally, I delved more into the series with time, and when Fire Emblem Awakening came out, I was quick to get ahold of it and quickly fell in love with the sheer depth the game offered. It wasn't long after finishing the game that I realized that there was quite a lot of wonderful aspects of the Fire Emblem series that Smash completely looks over, instead coming off as a series just filled with similar looking swordsmen (again, that sword symbol doesn't help anything...).
So back to Chrom. As previously stated, Chrom is definitely the face of Awakening; he's one of two main characters and is by far the most advertised. Putting him into Smash would certainly be good promotion for Awakening to those unfamiliar with Fire Emblem. Or... would it? While Chrom may be the most advertised, and thus the most recognizable character from Awakening, would his presence in Smash really drive people to Awakening? Because from the eyes of an outsider to the series, they might still recognize Chrom from all his promotion, but he's still to the general public just another blue-haired swordsman. He's recognizable, but he's most likely not going to make people intrigued about Fire Emblem and want to try out the latest game. If anything, his presence in Smash could possibly be detrimental to the series, as he could cement the "blandness" idea of the series in the general public and cause disinterest for the series, which could hamper future games.
And then there's Robin. Now while he isn't the face of Awakening (well, to be fair, he does get some advertisement, his face is just concealed), he is still one of two main characters of the game. More importantly though, there's the fact that he represents aspects of Fire Emblem that Smash currently lacks. Magic? Check. Hair that isn't blue? Check. Strategy? If they decided to make Robin a Stance based character (a role that makes MUCH more sense on him than on Chrom), he could certainly represent that aspect. Check. The concept of creating your own character? Again, a recurring concept within the series that will likely be present in future installments. Check. So when all of that is put together, Robin suddenly appears to become an ideal choice for the SSB4 roster; he represents key aspects of his series that aren't currently represented (sort of like Pokemon Trainer to the Pokemon series), these key aspects lend himself to naturally becoming a very unique fighter, and these factors would cause his presence on the roster to spark intrigue as to what the Fire Emblem series is really like, thus ironically providing better advertisement for the series than Chrom could.
It is for all this that I support Robin for SSB4. I only hope Sakurai feels the same way.