Mutopiaproject and LilyPond are great. I used Mutopiaproject a lot when I was a teenager who enjoyed playing piano. It and imslp changed how I explored music, and helped me develop my interests. I always preferred the LilyPond scores from Mutopiaproject when they were avaialable, because they were usually higher quality. I actually decided to give back to the community by typesetting some scores myself.
The thing that led me to stop contributing was ultimately seeing the progress that was being made toward automated music transcription. I saw this technology as something that would make the process a whole lot faster once it was good enough, and so it wasn't a wise time investment to keep writing out those intricate files by hand, but it also wasn't yet the right time for me to start using that transcription software, either.
At the time, the software that caught my attention was mainly the kind that helps users turn a scan of sheet music into something that could be transformed (with a text editor and some scripts) into a LilyPond source file with far less work than actually typing out all of the LilyPond input yourself.
I can envision software that does this, but it seems like a big project with very uncertain adoption outcomes.
Edit: I think software like this probably already exists, essentially, and definitely if you consider running one of the LilyPond command line conversion tools an acceptable step. The system's main differentiators would be being web-based (which isn't that uncommon anymore for music engraving software), and targeting LilyPond as the best-supported output.
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