Director, Harvard Office for Scholarly Communication
See my home page, bit.ly/petersuber .
Authors control the volume and growth of OA. They decide whether to submit their work to OA journals (gold OA), whether to deposit their work in OA repositories (green OA), and how to use their copyrights.
Any kind of content can be digitized, and any kind of digital content can be put online without price or permission barriers. In that sense, the potential scope of OA is universal.
One transition complexity is the fresh convert who supports OA in theory but doesn’t understand how to pay for it, how to support peer review, how to avoid copyright infringement, how to avoid violating academic freedom, etc.