I know this opinion isn't very popular, but I would like to see the series conclusion with the fourth game. At the very least, have the Ryo vs Lan Di vengeance story arc complete. If they want to branch off into something else, fine, but I want the original main story to be done so that I can have closure after 20 years of waiting.
I came here to say pretty much this. I want some degree of closure in Shenmue 3. Mainly with Lan Di. We all know by now Ryo won’t kill him. I hope 3 settles the score somehow. I don’t think that will happen but I don’t want it to be a Shenmue 2 scenario all over where we wait indefinitely for a sequel. If Shenmue 3 isn’t successful we’ll never get a fourth. Period. The prologue to the first game set up Lan Di as the villain. I want Ryo to defeat that villain in whatever way Yu envisions. In my mind that is the only resolution I care about. Anything else is icing on the cake. I know the story will continue with Tentei but I really only care about Lan Di right now.