Corporations have personhood in the USA, no?

For the life of a human, yes, for the life of a corporation, it's long but not too long. Specially for corporations such as Disney which are sure to last for quite a while.

Not saying this is a justificable position. I'm actually in favour of drastically reducing copyright (I believe 7 to 15 years might be a sweetspot). But a lot of laws are not made for regular human people any longer.