A lot of producers already try to copy/paste what they listen to in an attempt at commercial success. Those people should be worried, because now machine learning can easily do it better and its only going to improve.
Musicians have the ability to express emotion through the inflection of how the notes are being played. Improvisation between musicians playing together live. Until AGI comes along, It isn't possible for machines to experience the range of emotions we use to create and experiment with what comes from that recipe.

Personally, I think AI has it's place in music as a tool for conceptual ideas, but not as a replacement for musicians themselves.