Don't try to use common sense when it comes to the law. If DMCH doesn't send out the letters and try to defend their trademark someone could make the case that since they did not try to stop anyone, they should not be allowed to stop anyone. Disney does this all the time. Sending a letter is one thing, actually bringing a case against someone will cost a lot. I doubt they would do that unless someone is making enough money using the name to justify bringing a suit against them. In a lot of cases like this all they want is for you to sign a licensing agreement and pay a small fee if you are, in fact, making any money by using the trademark. That way they have control over who and how their trademark is used. For anyone who wants to fight this there is a good chance you would win, the name is so embedded into the culture. It would cost a fortune to do that which is why most people will either stop using the name or sign a licensing agreement. Does anyone think DMCH will get anything from Universal for the use of the name?