I'd prefer a scaling back of rights. For the first (say) 5→10 years you get what you get now. Then for the next 5 years, it's basically under CC-NonCommerical-N

I'd prefer a scaling back of rights. For the first (say) 5→10 years you get what you get now. Then for the next 5 years, it's basically under CC-NonCommerical-NoDerivatives, i.e. non-commercial non-derivate use is now legal. Then a few years later you lose the non-commerical protection (or maybe non-derivatives), gradullay until the work is essentially public domain.