For me the most practical way to realize such interactive programing, in ways that solve real world problems for me, with visual interfaces, is to use jupyter notebooks.
You just have to bind sliders to variables, and tie your outputs to graphical plots and there you go.
The big challenge is to come up with a large library of pre-built canonical graphical representations for different programming abstractions and being able to wire them seamlessly together.
Jupyter notebooks seem very close to what I would imagine a practical application of Victors ideas to be. In fact, its very close to a couple demos of his I remember.
You just have to bind sliders to variables, and tie your outputs to graphical plots and there you go.
The big challenge is to come up with a large library of pre-built canonical graphical representations for different programming abstractions and being able to wire them seamlessly together.