It maybe a matter of inventing a computer interface that is both expressive and interactive enough for music.
Think of the two keyboards: the computer keyboard where you type abstract notation for music and the midi keyboard where you type... less abstract notation for music.
So close yet so far :-). The good news is there are more Bachs where he came from. Give it five/ten years.
I have followed this field since the mid 90s and the amount of good music is just pathetic.
Bach himself might have a tough time with how tedious the workflow is.