They actually have hired modders many times and I believe at least on a few games incorporated things originally from mods, so that's not a great example. I get your point, but heavily modded Bethesda games have been some of my favorite gaming experiences ever, so I probably hope it never goes away.
If that's the case, then I guess I retract my statement.
And don't get me wrong here, I don't want modding to go away either, there has been some fantastic stuff done by the community.
It would just be nice if there was a bit more polish here and there. I've played both Fallout 3 and New Vegas, both without problems.
But Skyrim is the one game I can never actually finish, because there's always some stupid bug or glitch that prevents me from progressing at some point, with or without the patch.