We can dream - they'd need a new engine entirely to support this. Honestly though, I think the game has larger problems than whether or not it's open world. Exploring is boring when it's mindless rng plains/shrubs/trees. A huge world has to be filled with stuff (i.e. Bethesda games) to be worth exploring. I'd rather they get an engine so that churning out a decent dlc with a raid every 3 - 4 months is easy.