I see a lot of misplaced pages, spam, and utter insanity appear in the main namespace on commons. There is also a lot of confusion about how the main namespace should be used.
What do you think of the idea of moving all the galleries to a gallery: namespace, then reserving the main namespace for main pages and pretty much nothing else. After that point we could prevent main namespace page creation and make the edit page give a nice "You are confused, here is how you find help" message.
The work it would take to accomplish this could be completely automated, although some inter project cooperation would be required to fix gallery linking templates and the like.
I see a lot of potential to reduce confusion, and not a lot of real downsides. So I must be missing something. Thoughts?