Do they have the roster to do a brand split with all the injuries?
Yeah, they have a lot of talent they barely use anymore such as any of the following (although, they are midcard and below):
Tyler Breeze, Fandango, Darren Young, Damien Sandow, Diego, Fernando, Ascension, Stardust, Summer Rae, Natalya, Jack Swagger, and a few others. Bring up a few NXT talent and you will allow for their top talent not to get burnt out/injured so quickly if they begin to use their midcard talent/jobbers more. Most of the talent that they aren't using above are all early 30s or so, so they have a more "time" left before they lose a step like Big Show, Mark Henry, and what not. Right now, Smackdown is used as rematches from Raw and little to no story development, so a "brand split" of any sorts would help out with keeping bodies from always getting injured having to wrestle so much in one week with house shows included.
While I didn't enjoy the first brand split all that much, it could be where the champions have to wrestle on both shows, while the midcards are totally different and compromised of different talent to make shows at least somewhat unique.