On first glance you can probably do nothing to give this question a chance. Why, you ask, well:
- this site focuses on providing specific answers on specific questions. Any question about package managers has kind of a theoretical touch so any answer might be right
- whatever is discussed around this topic will have zero influence neither on Apple nor on anything else
- in a way there are already some package managers available (homebrew, macports), so the question is answered by real implementations
- OS X is not Linux or BSD, the Mac App Store solves the problem quite nicely for most people
What you should maybe ask yourself first is which specific problems a package manager does solve, how (if at all) they are already solved currently in OS X space and what (if anything) is left unsolved for most users or at least for yourself. This may lead to an answerable question at the end.