Nobody is saying why it won't happen. It's easy saying it will not happen, but explain why. So far someone said, needing a "library" to do it. Well this can always be on disk 2 so we should still be able to do it on the console.
From what I read, it is Sony and Micorsoft and to some extent Nintendo that will not allow this to happen for what ever reason. I am sure Bethesda would love to give the consoles the ability that PC players can do. Just Microsoft and Sony does not want this to happen. Why, I guess because they get no money out of it.
Only two people gave no reason for why it will not happen, the rest of us gave reasons a plenty.
Your "library" thing isn't the problem. The CS is a tool in development and testing, and thus already exists on the PC. For consoles this is the console SDK, which gamesas doesn't have the right to give to end users. They would have to write up a tool from scratch that:
1. works with the console's libraries
2. doesn't infringe on the SDK, which would mean building from scratch for something proprietary
3. works with the console's limited input methods
4. Develop a system for uploading and sharing for a game that has no online aspect.
5. doesn't cost a dime.