Or we could make it a gradual process using Creative Commons' layered licenses: Full copyright for 14 years, CC-BY-NC-NDSA license for next 14, CC-BY-SA for nex

Or we could make it a gradual process using Creative Commons' layered licenses: Full copyright for 14 years, CC-BY-NC-NDSA license for next 14, CC-BY-SA for next 14 and CC-BY till the life of author and public domain thereafter.