There are countless artists and authors who go undiscovered for years before having a breakthrough and becoming popular. There's a lot of non-fiction books that are slow but steady sellers for years. Some of that non-fiction needed years of research.
Drop copyright to say 5 years and you hurt all of those creators, potentially quite badly. The Disney's, George Martin's and JK Rowling's of the world would be hurt vastly less as so many of their sales are right around release.
If I had to throw a number out I'd go with something like 20 years, and upto 5 or 10 years beyond death - to cover those writing an autobiography or creating something in their final years.
We see the same sort of thing with patent trolls - if all you do is buy up IP and then sue someone, that's not a model that furthers humanity or IP creators.
Any law like like that would be circumvented through creative “leasing” of royalties.
Individual copyright: 25 years or date of death + 10 years.
Corporate copyright: 25 years.
a) That +10 years after holder death no longer makes sense
b) Corporations would be unable to posses copyright.
a) Is a clear and simple exception, that permits inheritors to receive proceeds of a work for a limited time. It would prevent the abusive control some estates have over copyright decades after the creator's death.
b) Intent seems rather like the clauses for code copyright many of us have had in contracts of employment. IANAL but I'm sure something could be drafted that limits transfers but still allows design companies assigning copyright of the customer's new logo. Perhaps the only transfer can be limited to the first three months after creation or something.
Should I have to pay to avoid having those posts become public domain within my lifetime and I lose control of what I’ve written?
A reward system for content creation by definition has to be a pyramid scheme, due to the need for the general public to have examples of normalized contrasting quality in anchoring supposed worth as well as the need for the governance structures to have a well diversified orchard of luscious fruit ripe and especially bountiful enough to cherrypick which works are most applicable for promotion at any given time on the carousel wheel of policy.
Removing copyright protections from them would be very disconcerting. I don't want to find my photographs as postcards sold somewhere without any licensing fees paid to me just because they're old.
Consider also that the GPL and all software licenses use the power of copyright protection as the legal force behind how they work. If copyright protection was 10 years, one would be able to take any 10 year old code and close source it (and sell it) with no legal repercussions.
Note that if copyright only lasted 10 years you could take them down but somebody else could simply republish them. The real question is, with only a 10 year copyright would you take and publish fewer photographs overall?
If the copyright protection expired in 10 years, releasing them at all would be allowing someone else to monetize them in a few years.
So? 10 years is eternity in the world of software. If some company wants to fork, say, gcc as it was 10 years ago, and try making money selling that... well, people have the right to ruin their business.
How about 10 year old Linux and not having to jump through any hoops or legal problems of TiVoizing it?
Or 10 year old iText from when it switched to AGPL? Now you can completely ignore that.
I can point to people running even older iText- they would love to update it to something more recent with no copyright protection at all under a 10 year limit.