Originally Posted by HarryT
Couldn't be done. The International Berne Copyright Treaty, to which the US is a signatory, requires a minimum copyright term of "life+50 years". Changing that would require re-negotiating Berne, and that's something that would probably take decades.
Just a side note, the group that wrote that particular survey has little respect for international treaties or the UN. The Berne Convention was probably the exact last thing on their mind.