Perhaps more people will take to composing. If with the help of this technique, I can turn a small idea into a mediocre piece of music without too much work, I'll definitely play around with it. (I say mediocre, because I guess you'll probably still need skill to produce good and original music with it. But I will show interest even in mediocre stuff, if it's my stuff.)
The story mentions that he's contracted with a "pop group" -- if it's anyone noticeable, and if the music is at all good, I don't believe we're exactly going to have a teen revolt on our hands.
(Quite the contrary -- real creativity is rare in pop, and if a computer can bring it, this could catch on just as autotune did. Maybe even bigger in the long run.)