Here's what I would consider a fairly realistic roster that I got from this whole Ridley discussion:
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The only character I see as a real reach would be the Lucina and Chrom combination, but I just want I different type of character like Pokemon Trainer in the roster. In this pair, you switch off between them but only one of them attacks at a time.
Adds: King K. Rool, Dixie Kong, Ridley, Lucina/Chrom, Classic Link (who goes by Young Link)., Palutena, Little Mac, Isaac, Newtwo and Zoroark (who is just a place holder for any generation V/ VI rep). I have this idea for a Pokemon Trainer who is battles with the Pokemon instead of Zoroark, so I still need to flesh them out.
New Franchises not at E3: Golden Sun, Punch-Out!!
No Takamaru (just to make roster smaller he could easily fit into that left slot), No Shulk (between him and Isaac, coin flip between the two), No Krystal (due to dormant series, could make it as late add), No Miis (No interest), No Pac-Man (based on no priority for Namco characters statement)..
Problems: Not enough retro characters, which Sakurai said he was going add. Not a lot of new franchises overall in comparison to other threads. The roster should be smaller, but I can't cut no more.