Do you guys know this doesn't count for corporations (which I presume you have the most aversion against)? For example, it's irrelevant how long mr Disney has been dead because the company still exists.
I assume you're talking about work-made-for-hire? As far as I know, that's mostly a concept in common law countries; I'm not sure it applies to Switzerland. In most European countries, as far as I know, the rights of authorship always belong to natural persons.
How does that affect works exported from common-law countries to civil-law countries? Does the same work have different copyright holders in different jurisdictions?