I guess only if there is a need for them the ps button was only added this gen because that kind of button was need for the software interface. analog sticks were added during the ps1 era for improvement in controls, the shape buttons were added in the original design for menu control, X for eXit and O for enter. which was kind of backwards, I think the west had a problem with that was that X marks the spot on a map and O is around are road signs for warnings. directional buttons for menu navigation and all the other buttons.
so what I am saying is that if they find a reason to add another button(s) they will unless they can't fit it in the controller design.
edit: I agree in part with what ajescent said but for the moment there is still some things these kinds of interfaces can't do and buttons can do very well so it would depend on the kind of improvement and what suits it as well imo.
correct me if I am wrong
stop me if I am bias
I love a good civilised debate (but only if we can learn something).
