I would say this is a good idea but probably will be better is the maps, shaders and Blueprints can be editable as that type of code, I mean when you edit in visual editor you edit at the same time the code and the code can be opened out of the engine to edit it.
I give a +1 to this, I want more clear work, probably slowdown the performance in the editor but I want this cause can help for script languages and help to corrupted files to edit it and figure where is the problem better.