Fascinating, Mr. Professor (great article). Let's take the concept of sampling to another level... We know that if a piece of art (music, photo, writing, etc.) is changed enough, it's freed from its copyright shackles. Where is that line of "enough?" That's where lawyers come in, unfortunately. Now think about AI (another new digital tool) and how it "samples" kajillions of things all day long and changes them a little bit. Lawyers haven't gotten involved yet but they will. For now AI is an interesting tool like the 'Cassy' you refer to and will help enhance the creativity of writers. Future though... unknown.