I, personally, think this is wonderful! Why must music be limited only to those who have taken the time to learn one or several instruments? For many people, I would imagine that time constraints in their lives makes that impossible. But does it necessarily follow that those people still cannot create unique or interesting pieces of music?
There are some people who say that Daft Punk technically aren't musicians, since (to my knowledge) they don't use any real instruments; this, despite the fact that they can and have played- however briefly- in live bands. To me, saying that they aren't musicians simply because they don't play real instruments is a flawed argument. In the same way, just because someone sits down and makes a classical guitar piece without actually playing a guitar, it doesn't necessarily follow that they aren't good musicians. Anyone can slap a few notes down on a midi synthesizer, but if the song ends up sounding beautiful, is it such a hard thing to acknowledge their skill?
To me, this is simply the next musical evolutionary step. If I had to make a comparison, I would equate it to saying that Beethoven wasn't a real musician because, although he wrote many scores that included brass and woodwinds, he never actually played those instruments, himself. He was, essentially, doing the same thing. I say: let everyone explore music! If any program out there can inspire more musicians by making it more approachable, it's a good thing in my book.