I still have a gut feeling that Ashley, Takamaru, and Isabelle have a pretty strong chance of being upgraded to playable.
The fact that they are both Mii Costumes and ATs makes it seem like Sakurai thinks of them as a.) important or at least memorable characters from their series and b.) characters people want to play as (hence the costumes).
Like I said, it's just a feeling... but I stand by it.
Doesn't really matter as the Excite Biker was still seriously considered for an NES representative despite the fact that he already had at the time an upcoming game on the 64 which was revealed to the public at the pre-E3 conference on May 12 1999. The idea that a potential retro "rep" no longer counts as one due to having a new game was never true and thus Little Mac can still be considered a retro character.
I mean there is also no slot for a "retro rep" or rules to how many can or should be included in a Smash game. The only Smash game where we KNOW a character was added to specifically to represent the Famicom classic era was Melee with Ice Climbers.
I mean, if you want to argue, Duck Hunt was as much a hardware rep (zapper) as a retro pick, so Smash 4 had no pure "retro" character.
In any case, my point was that Excite as a franchise has a lot going for it and could make it in on merits besides just being "retro."