I vote in favor of not resurrecting the brand split but rather leaving it in the ground where it lies already.
One way out of this could be to say that while the two shows have separate brands, maybe people can jump to the other at any moment? Just like how people can freely defect to different promotions in real life? The logic could be that each show has 'ownership' over certain titles that can only be defended on that show, and if you have the title and then defect to the other brand, you can't bring the championship with you so you'd end up stripped of it. For example, say Raw has the WWE Championship, Intercontinental Championship and the Tag Team Championships, while Smackdown has the World Heavyweight Championship, United States Championship and Diva's Championship. However, the wrestlers themselves can decide to go to whichever brand they want to, as long as the General Manager of that respective brand wants to sign them. This way, titles remains consistently with one show and because guys are 'apart' of a brand but aren't forced to stay there, WWE can have two guys feud if they want them to by simply having one of them jump to the other brand and get into a spontaneous situation where a feud with said wrestler erupts without having to wait until the annual draft show to have them end up on the other show.