As far as changing the interface, I don't think PG has to be as drastic as some of the above posts suggest. Afterall, doesn't a DAW have a crazy amount of buttons? I simply don't see this software as being for a casual user, so not much point in making things overly clean.

The real change that PG needs to make is get rid of the ComicSans like font for chords. Hate it. I suspect that font alone sends so many (below age 45) away. The good news is that a guy from Germany appears to be helping resolve that.