Having played Bloodborne and finished it, I find myself asking this question a lot. Bloodborne executed on a superb evolution of Souls combat, but I think we can all agree that in doing so it became focused on one kind of play style. It is less varied, but after Ds2, it is probably the shot in the arm the series needed. So, the question is what would From do next? A sequel to Bloodborne, moving further into its own territory as a game series? A return to the Souls name, perhaps a Dark Souls III? Or something completely new?
Whatever the case, I hope another one of these games get made. I'm fearful that Miyazaki may move on to something else, but I would play any new game by him. If these games live on with a different creative lead at From, that would be a little sad but understandable considering how long Miyazaki has been making Souls games. I don't see this style of game going away anytime soon, but I also don't see Miyazaki making them forever.