Yeah. Not only sad for us, it must be also sad for Hasbro itself, cause it's supporting the brony fandom and it's activities. How stupid can a law be, when a trademark holder has not the judicial right to decide for itself what should be done with his trademark and what not, because of this law?
No, unfortunately Hasbro cannot decide allowing it. The US trademark law says, that Hasbro has to defend it's trademark, when it comes to an violation. If Hasbro doesn't do it, it will loose the trademark. And that would mean no new pony episodes for us anymore.