[HangFire]

Its bad because it creates a slippery slope. They're going to keep pushing this farther and farther now since they've gained this little bit of ground. As its been said before, others such as ISPs are going to eventually be held responsible for their users.

Plus, as Botmeister pointed out:
If strictly interpreted the ruling means that these hi-tech firms will have to try to predict the ways people can use these devices to pirate copyrighted media and install controls to stop this infringement.

This means eventual monitoring by law enforcement of what ISP's clients do, and it means built-in corporate control of user's PCs (such as DRM).