Frankly, this might be the sort of kick in the ass people need to start writing more secure software. Who wants their software to be known as the MPAA's attack vector? On the other hand, I suspect that the MPAA would be in for a world of hurt if they did this. They would not only be dealing with file sharing, but also a coordinated campaign by blackhats to take down their systems, boycotts organized by the EFF and th…
I know Anonymous is one of the prime offenders in this area, but I wouldn't be surprised if many on Reddit organized and attacked the MPAA's systems.