I'm a tiny bit confused. You refer to arc handling the packages, which suggests to me that the core stuff deals with the packages. I think you mean that whatever tool gets written in arc for managing arc hacks would handle the packages. Am I putting words in your mouth?
Yes, that is correct. I'm sorry if I confused you. Maybe in the future the core of arc would handle packages to provide namespaces, but I meant more that since arc functions will be handling the use of the meta-data, it should be easy to turn that around and generate the meta-data from how you're using it, and a little more information about who you are and what you're trying to do.