Well, it's time to disallow functions, since someone can misuse their names. And exceptions, since someone might use it as goto. Might as well get rid of non-primitive types, there might be a very bad person willing to name a class with a completely meaningless name.
I have never heard a convincing theory of why some language communities were careful in their use of operators, whilst others went overboard. In the absence of such a theory, it's a risky feature to add.