15 years, 5 year extension, that’s it. That’s all we ever need, and there is no logical reason to extend it outside of the kind of greed they warned about in The Bible. Additionally, any and all source code, assets, etc should all be entered into the copyright office and released when it enters the public domain. This should even include printing assets and high res copies of artwork.
Copyright can be intrinsic, sure, but only to maybe 5-10yrs, far less than the maximum to incentivize registration (and thus incentivizing archiving of culture).
I should be able to freely download every Disney film prior to 2006, compile Killer7 for the fun of it, buy a hardback of the LOTR trilogy from any printer I wish, and do so without any interference from the copyright holders.
However, because we don’t live in a utopia and Sonny Bozo became a politician, I’ll be waving a certain jolly flag for the foreseeable future.