A FLOSS like LilyPond is a great opportunity to share (musical)
culture, at the lowest possible cost.
A project like Mutopia is a promising future: digital scores (of public
domain music) that are free of publishers' rights.
If and when "big" publishers use LilyPond, the result will be more
restricted access (through cost) to culture (because they won't release
their proprietary contents).
I've thought for a long time that the right way to go is to seek
public funds for engraving public domain contents with the purpose
of publishing it under a GPL-like (or Creative Commons) license.
Me too.. but unfortunately it's not a good moment to seek public funds. And I don't like much having to deal with public istitutions.
I would prefer if more people were able to use LilyPond and learn to have fun and learn and help others while contributing to Free Culture. That's why I started thinking about bringing LilyPond in music schools. Even though I never tried because of lack of time, I can imagine two major issues:
1. LilyPond is not considered as a professional tool because it's not used by the publishing companies. In general schools teach what the market asks. That's why I think that this effort by Urs is important.
2. Text input. Frescobaldi is doing a good job here, but still..