But I think they're coming at the wrong end. Their schematic capture was painfully slow when I tried it a couple weeks ago, and I (and I suspect nearly every other electrical designer) rues having to change tools. If someone wants to become the 'github of electronics', I strongly recommend working on getting some sensible versioning and sharing going without also tackling the problem of creating EDA tools.
Having said that, a shared crowdsourced library is a big help, and some others have already noticed the good it can provide: https://github.com/adafruit/Adafruit-Eagle-Library