Ilmari Karonen wrote:
So we move it to, what, "Wikipedia:Main Page"? "Portal:Main Page"? But what shall we do when something comes along that deserves _that_ title?
Once it's out of the article namespace, nothing can come along that is more deserving of the title "<prefix>:Main Page" than the Main Page itself. I really don't think we're in any danger, if having moved the Main Page into a project space, of things spiraling out of control and the Main Page forever being moved from namespace to namespace for years to come.
Things pop up in the "real world" that need new articles with new titles. Nothing pops up in the project spaces except what the community wants there, so something will have precedence over "<prefix>:Main Page" if and only if the community really wants it to have precedence.
Cheers, - PeruvianLlama