I don't see this happining to consoles any soon.
Making this enable would mean that you can acces the files and mod everything in the game you want, wich may cause a great disadvantage for the players who don't know about this stuff.
They could release their dev tools like in WaW but add a system to uplaod it to your profile like you can do in ELITe with your classes
I'm pretty sure mod tools on consoles have never extended past marketplace games, and so having them on a fully-fledged shooter would be fairly unlikely.
They released full modding tools for WaW once the DLC lifecycle had ended, and only partial tools for BO. Maybe they'll do it for PC this time around, maybe they won't.
There has been plenty'o' talk about more ELITE integration and customization than ever before, so I'm not going to say it's never going to happen, but the odds are slim to nil'.
Best case realistic scenario would be amazing PC mod's being reviewed by 3arc dev's and being ported and uploaded to the marketplace as DLC for consoles.