I know the Danish courts has ordered Danish ISPs to block The Pirate Bay, so I doubt the status quo is that ISPs are required not to block online services.
Yes, but according to this, ISPs may decide themselves to block stuff, without any court orders. This is something MPAA has been pushing for a long time with ACTA, TPP, and apparently with this, too.
They want to bypass the judicial system, so they can censor stuff en masse, like they do with Google/Youtube and their automated takedowns, but since it's at the ISP level, probably at a much larger scale and in a more comprehensive way.
If this passes by and enters to action, you'll notice the difference (HN not loading, or loading extremely fast while your FB connection will go as fast as ever).
If you don't have a facebook account, the you don't have internets ;-).
They want to bypass the judicial system, so they can censor stuff en masse, like they do with Google/Youtube and their automated takedowns, but since it's at the ISP level, probably at a much larger scale and in a more comprehensive way.