I'm not a lawyer, but as I understood, the famous "the code is the law" quote is written in the DAO's terms of service (that's the whole reason why it could have any legal relevance at all: They basically tried to make the code their terms of service)

Therefore changing the code would be equivalent to updating the terms of service - and many judicial systems restrict when and how you can do that.

So I don't think it would be that easy.