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Any "Life+" copyright term is too uncertain. It gives wildly different copyright lengths to works created at the start and end of someone's career.
The UK System before we joined Berne seems best. A fixed term from publication, or the lifetime of the author, if that's longer.
So an author retains copyright during their lifetime. When they die, copyright continues on all works published less than the fixed term ago. Their works gradually come into the public domain, which is (IMO) a benefit to the estate.
Unfortunately, the Berne convention introduced the Life+ system internationally and unless something extraordinary happens, I don't see it ever changing from that.
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