Wasn't one of the principle complaints about Venom that he was too small? I think before they try to bring him back, they need to be certain they can convincingly CG him. And if this really is a total reboot, it wouldn't make much sense to bring in Carnage before Venom has another turn.
And I wouldn't mind seeing Scorpion as long as they make him look less camp. But then again I was the kind of philistine that preferred Green Goblin's movie look to his comic look, so...