You've drank too much kool-aid. Copyright law is to incentivize investments in creative works, not the creation itself. Most people that profit off of creative works have not created anything of value themselves.
To quote the Constitution, the purpose of copyright is "To promote the progress of science and useful arts, by securing for limited times to authors and inventors the exclusive right to their respective writings and discoveries." ie To increase how much creation there is.
If you charged people $5 for a lifetime pass to hang out in and inspect your house, should they not be able to try to build their own version of your house 20 years later?
When you enter something into the culture, part of it leaves your control, and thats a good thing.
Are you claiming they wouldn't have made the music otherwise? It's hard to imagine such megastars deciding that the marginal effort of another hit album just wasn't worth making unless they could collect hypothetical revenue for more than 2 decades.
Copyright law is to incentivize creating these works so that more stuff can get into the public domain. We've shot well past that point with excessive durations, and the public domain is suffering.