there isn’t one.
every gui will be available.
I receive a lot of resistance when I suggest that the future of graphic user interfaces doesn’t exist. Here’s why I think this. The graphical interface is soon to become a completely personalized experience. That is, the machine will optimize the interface for you. Sure, there will need to be some uber designer that sort of sets up some initial styles and maybe set some basic parameters but ultimately the machines are going to decide WITH YOU the best way to integrate.
This should be an unsurprising prediction considering this is how us humans interact. We constantly adjust ourselves to each other. We change language, fashion, body language, cultural norms, etc to improve our understanding. So as machines increase in sophistication we ask that the interfaces changes with our desires (values/ideals/patterns).
Beyond GUIs though the technical world moves ever towards an intelligent web of computational services instead of a hyperlinked HTML web of linked presentations. That means things are moving quickly to a semantic, computational approach where everything (interfaces and data!) are objects for computation and able to be input into whatever connects to it.
The problem of user interface design now is that it’s happening mostly in art and production circles instead of through a real collaboration between artists, behaviorists and computer scientists. What’s ideal is a group of people that all understand the arts, behaviorism and computational theory. You can’t really do solid UI design without at least those types.
In the very near future we will not obsess with and talk about GUIs. We will talk about experiences in the world and with concepts and art and characters. And all very naturally with machines and their “senses.” This interaction with the machines will inform the presentation.