The command console is VERY powerful. It is able to change nearly every setting about the game, including graphics settings. If console players were allowed access to these functions, people would inevitably try and up the settings further then what the hardware can support, and potentially cause the game to no longer function properly or at all. Microsoft and Sony don't want to be blamed for these things when they are clearly user stupidity. PC users can cause these things as well but because we can dig into the files, we can fix anything we do while console users can't.
The item adding commands and god mode commands were made for testing things. Literally. That is the history behind cheat codes. Developers needed a way to test their games without having to actually play the game every time they just needed to check a graphical change on level 98.
Programming a limited command console is indeed possible, however the time needed to develop one for console users would not be worth the time invested. So such a feature is not even within the scope of Bethesda's list of priorities. So its not that this can't happen, but it sure won't happen, that is for sure.
Again, I stated I understand that it is powerful but just because something was designed for one thing doesn't mean it can't evolve beyond it's original purpose if used differently because that's exactly how cheats came to be cheats, as you just stated. Besides that, the time taken to develop a limited console isn't as bad as you are making it seem as the only problem is removing and/or limiting potentially problematic commands while still offering up a variety of commands for Xbox/PS3 users. Not only that, it doesn't even have to be included in release, it can be developed as part of a patch or free download later on after release as Bethesda has shown they are quite capable of adding drastic changes to the game in patch form. (See patches 1.5 and 1.6)
No matter how you slice it, it can be done and the only thing standing in the way is people saying it can't because they don't like the idea of not being the "Superior ones" otherwise known as your typical PC really devoted fan. Because the only thing they have that they can use to argue their false claims of superiority is mods and console commands. This is just a case of PC only users blowing it out of proportion and putting down console only users.
Now don't get all uppity with me after this post because this thread is not going to make a big difference and even IF, BIG IF, Bethesda did implement this idea it in no way affects you whatsoever. So there's no point in debating it. All I do is state the obvious and things that I see here and I saw a bunch of uppity PC only users flat out deny this persons idea, indirectly stating the idea was poorly thought out or just plain stupid, because they don't have the time of day to actually think about anything more than putting somebody down.