Man I'm still thinking about what Bryan says he wants to do with Smackdown and if we had a hard brand split, These guys would probably be my primaries for a while:
The top 6 - Bryan, Ziggler, Rollins, Ambrose, Wyatt, Orton
Midcard 6 - Sami Zayn, Adrian Neville, Finn Balor, Hideo Itami, Tyson Kidd, Cesaro
Tag Team 6 - Lucha Dragons, Blake/Murphy, The Mechanics, The Usos, Dustblowers, Vaudevillains
Diva 6 - Paige, Emma, Charlotte, Sasha, Becky and Bayley
The good thing about something like this is I wouldn't have to make them all wrestle every night, I can have some wrestle and the others in vignettes to develop their characters on each part of the card.
While this would certainly make for a crazy awesome Smackdown product, Raw would be absolutely unwatchable if that's the case. If they do a hard brand split, I'd hope that they at least try and even out the ring talent of the roster. Here's how I'd shake it out - I went to 8 "midcarders" that would include singles guys a bit lower down the card too:
Smackdown:
The top 6 - Bryan, Ambrose, Wyatt, Orton, Ryback, Barrett
Midcard 8 - Neville, Itami, Cesaro, Axel, Tyler Breeze, Erick Rowan, Heath Slater, Zack Ryder
Tag Team 6 - Blake/Murphy, Los Matadores, The Usos, Vaudevillains, Miz/Mizdow, New Day
Diva 6 - Paige, Emma, Bayley, Summer Rae, Alicia Fox, Naomi
Raw:
The top 6 - Cena, Ziggler, Rollins, Reigns, Rusev, Sheamus
Midcard 8 - Zayn, Balor, Kidd, Swagger, Harper, Bo Dallas, Fandango, Justin Gabriel
Tag Team 6 - Lucha Dragons, Dustblowers, The Mechanics, Ascension, Prime Time Players (reunited), Adam Rose/rotating Exotic Express member
Diva 6 - AJ, Charlotte, Natalya, Sasha, Becky Lynch, Bellas
Realistically, you might need to balance the roster numbers to have a higher total on the Raw side. But in the interest of keeping it pretty much even, that's how I'd do it. And yes, I know I left out guys like Big Show, Kane & Mark Henry... don't really know or care where they fit in here though.