In the US, federally funded research is already required to made available without paywalls within 1 year of publication. Open-access advocates online generally seem to be unaware of this, and that current goalposts are therefore (a) immediate open access, and (b) open-access publication of all scientific research regardless of funding source.

https://obamawhitehouse.archives.gov/blog/2013/02/22/expandi...

https://www.nih.gov/health-information/nih-clinical-research...