the problem is that very rarely creators own the copyright, most of the time it's transferred to corporations. in principle I agree with you, but corporations should have restrictive limits (i.e. 20 years after first copyright transfer from a natural person) - and just to be sure, make it so that royalty contracts are null and void if they cover a duration longer than 5 years, so that corporation cannot workaround the issue buying new property for pennies using forever exlusive royalties and preventing renegotiation once the property becomes famous (i.e. avoid the current musicians/labels contracts where unknowns get scouted early and chained forever)