Here is my dream roster. This could very well be a possible outcome. I tried to keep them in line with what they have done so far, but I moved the clones, confirmed DLC, and *possible* DLC in with their respective franchises. All this would add is 4 boxes on the left/right side of the character select screen . For 6 DLC characters, that is pretty good. This is assuming we get one character off of the Smash Ballot AND that character is King K..lol. Not sure why, but I can't see them adding even more characters due to Sakurai already at wits end. The DLC characters have yellow boxes.
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Edit: The only franchise I had to actually relocate was Kid Icarus due to Fire Emblem getting bigger, assuming we get Roy as well. Honorable mentions for 4 more spaces on the select screen would be Ridley, Isaac, Banjo, Dixie, Shovel Knight, Rayman, Inkling, Ice Climbers, Chorus Kids, and Bandana Dee.