Knowing that Shenmue 3 will be released in 2019 and the PS5 and the new xbox will be launched in 2020 if rumors are true, Shenmue 4 will be create for these new consoles?
Another thing that "worries" me is the engine, will be Unreal engine 4 appropiate to make a Shenmue 4 with new generation graphics?
If Shenmue 3 has enough succeed, they will make use of Unreal engine 4 again so that they can use the "know how" and many material from 3 so the 4 would take less time to make it. Using another engine would be an error in my opinion.
Inter generartional games don't take a big leap at the begining, so I think it would not be a problem. Also when a new console launches the "old" generation is still active for at least 2 or 3 years. For example, Metal Gear Solid V was released 2 years after PS4 and Xbox One launch on PS3-360 and the new consoles, and Sega has been releasing Yakuza and Persona on PS3 until Kiwami, 2 years ago, I think. So I am not worried about that. Also it makes no sense to make the jump to a new Engine (unless it is backed by Sega and they use Dragon Engine) when they have trillions of assets and mechanics to reuse