Guy from the 80 said:
I enjoyed Infinite but I'm starting to grow tired of the Bioshock formula. Play as some mysterious person, play linear path to bad guy that talks to you via radio, "talk" to plot characters you cant interact with, finish game without any choices what so ever.
That's actually kinda why there CAN'T be another Bioshock, or at least there shouldn't be one. And not just from a gameplay/mechanical standpoint.
They've let the cat out of the bag with the ending to Infinite. "There will always be a man, a city, and a lighthouse". That implies that the general story has been told in many different ways. When you think about it, the stories of Infinite and BS2 are VERY similar from plotpoint to plotpoint. Delta = Booker, Eleanor = Elizabeth, Lamb = Comstock. Delta and Booker are both father-figures trying to get their daughters (in one case figurative, in the other literal) back. The daughters have been kidnapped by power-mad leaders that literally have a cultish/religious following (the people in Rapture worship Lamb just as the people of Columbia worship Comstock). Said leaders are wanting to use the power of the girls to utterly change the world which they believe is overgrown with filth (Comstock wants to have Elizabeth go on to lead a fiery purge of destruction on the world below while Lamb wants Eleanor to go and establish a new world order as the smartest, most powerful being on the planet...or something like that

).
The point is that they actually made the Bioshock formula kinda part of the story itself. In worlds in which Comstock never rose to power because Booker never went through with the baptism, that allowed for Andrew Ryan to rise to power and create Rapture. From this point on, every game would essentially follow the exact same formula: "A man (deranged leader), a city (in an extremely unlikely place), and a lighthouse (the symbol that connects them all)."
Beyond that where would they build the next city, hmm? They've gone under the sea, into the sky...there's not really that many "impossible to build there/fantastical location" places left. Unless they'd like to say that steampunk early 1900's technology had already reached into outer space.