How much disruption is open access worth?

Let's not forget that it is not just the general public that is disadvantaged by academic paywalls. These paywall make it difficult for tertiary institutions in low and middle-income countries; for smaller institutions, especially those in rural regions; and for scientists and researchers in industry, not-for-profits and local government; for science-based startups. And who knows how many independent scholars might emerge if access to the literature didn't require (as it does now) that one is an employee of a large, well-endowed institution.

Surely the demand for open-access publication can be simply measured by the usage statistics of SciHub?

UK citizens have free access (via their public library) to subscription journals through the 'Access to Research' initiative http://www.accesstoresearch.org.uk/ . This initiative came out of the recommendations of the Finch group and started in 2014. However I have yet to find a member of the public who knows about this service. Few librarians seems to be aware of it either...