How will we know when Open Access reaches a tipping point and becomes a mainstream movement? Maybe when the mainstream media takes up the cause.
This article in the Economist, makes the case for taxpayer access well:
When research is funded by the taxpayer or by charities, the results should be available to all without charge
PUBLISHING obscure academic journals is that rare thing in the media industry: a licence to print money. An annual subscription to Tetrahedron, a chemistry journal, will cost your university library $20,269; a year of the Journal of Mathematical Sciences will set you back $20,100. In 2011 Elsevier, the biggest academic-journal publisher, made a profit of £768m ($1.2 billion) on revenues of £2.1 billion. Such margins (37%, up from 36% in 2010) are possible because the journals’ content is largely provided free by researchers, and the academics who peer-review their papers are usually unpaid volunteers. The journals are then sold to the very universities that provide the free content and labour. For publicly funded research, the result is that the academics and taxpayers who were responsible for its creation have to pay to read it. This is not merely absurd and unjust; it also hampers education and research.