[simondotau]

How about copyright terms of 10 years for all works, or for a tiny nominal fee (between $1 and $10) you can list the work on a register for a further 10 years, which you can do multiple times up to a maximum of 50 years. The idea is to strike a balance between giving creators time to monetise their works while also allowing abandoned/unlicensed works to fall into public domain reasonably quickly.