It seems to me that if the Main Page could be simultaneously located at [[Main Page]], [[Main page]], [[Wikipedia:Main Page]] and [[Portal:Main Page]], everyone would be happy.
Now if only we had some kind of 'redirect' system to make these all show the same page, and a bit of code to hide the title so the difference was invisible to the reader, we could do this.
Oh, wait, we can. And we already do.
-Gurch