Machine-generated music might be functionally equivalent to human-generated music, but that ignores the cultural role of art as a shared human experience - witness the liturgy of live music. That can't happen with music tailored to each listener, it can't happen without tracks that are fixed in time and can be referred to. I can imagine it well-accepted for dynamic music such as gaming soundtracks, but I suppose that machine generation will be mostly a production technique resulting in branded pieces.