It seems to me like in 20 to 50 years humans will still be writing computer code, but hopefully some IDE-like 'block-based' editor approach similar to Jupyter N

It seems to me like in 20 to 50 years humans will still be writing computer code, but hopefully some IDE-like 'block-based' editor approach similar to Jupyter Notebooks will have taken over. Block-based editors let you mix in different "types" of artifacts like documentation, code, images, examples, scripts. It will need to be some kind of 'tree-like' structure with expandable nodes like a file system I think, so that for example underneath every method implementation you can have it's test cases right there with it, sort of 'inline'. I've also thought that eventually even web-browsers will be replaced with some system like this too, where everything is "typed" (like Semantic Web), so that both machine parsers, AI systems, and humans can equally well consume and understand the content. The problem is 'momentum'. People tend to build new capabilities on top of the old capabilities like layers of an onion rather than rebuilding something new from scratch like a Jupyter Notebook-like "do everything" browser/IDE/editor.