Contracts require consideration. If I own something and sign a contract with you that allows you exclusive control over it, then I have to be getting something in return. I'm not a lawyer, but I believe that there's some restrictions on consideration that can render a contract void if it is incredibly lopsided. I don't know for sure, but I'm guessing that a contract exchanging an invention earning billions per year for a five figure salary and a position that can be terminated on a whim might not be a valid contract. I really don't know about that though.

The other nice thing about personal ownership of copyrights and patents is that it makes the whole retroactive copyright extension and post-mortem copyright assignment transparently illegal. If only the creator of a work gets the monopoly over its distribution, then the termination of the creator must entail the termination of the monopoly. I'm very much not a fan of eternal copyright, so that alone would make me a bit happier.

I think I've probably threadjacked this way too far, so I'll just shut up now. Maybe I'll start a blog somewhere where you can rip holes in my half-assed ideas without us bothering anybody else :)