I've blogged about this from different angles, but to condense it:
* Sheer availability: publishers must make titles available for library lending. Holdouts from the major publishers create huge vacuums for access to ebooks. Practitioners understand this as a priority better than other stakeholders. It really doesn't matter if you offer a huge backfile of 19th century material if libraries can't buy or license Hunger Games for their users.
* Platform neutrality: books are often only available on unique platforms. Sometimes we can get around that through third-party discovery (for example, WorldCat Local "unites" our ebooks), but once users click on links they are plunged into proprietary software.
* Device neutrality: this isn't simply about the technical obstacles. Look at the whole business with Overdrive and Kindles. I think it's technologically naive to say ebooks should be available on every possible platform, but definitely the obstacles shouldn't be unwillingness to work with partners. I notice Overdrive is coming out with a browser-based reader--interesting development.
* Accessibility: some large organization can certainly use its clout in this area to lean on device manufacturers and to warn libraries about accessibility limitations for devices they are considering to purchase. But it can't be an ALA committee that spends three years deliberating the issue and then comes out with a lukewarm report -- devices emerge quickly into the spotlight and need immediate analysis. Partnering with organizations such as NFB could be useful.
* Gov docs: this is a great time to get them all online. DPLA may tackle this one, I think.
* I would add interlibrary borrowing and lending (aka ILL), one of the bulwarks of library services for the past century, but I fear that's a done deal. Libraries that have been in the ebook space for a long time (academics, primarily) are (unfortunately) resigned to the idea that only last-century "returnables" can be shared. Nobody wandered into this space until the public libraries began doing ebooks in a serious way. Kind of interesting that academics rolled over so early on this issue and with very little noise.
Basically, because nobody's stopping them, publishers have used new technology to shred fair use to near-death. That big message needs to be drilled home.