Not in every country, and secondly if you're basing it on life of the author then that does't solve corporate copyright unless you tie it to the live of a particular employee.

You could do "life of author or X years, whichever is longer". Or include a period after death.

But you see how the complexities come in.

Either that or if it didn't work, insurance industry would've created a product that makes it work for commissioned works. Nothing happens in isolation here.