When the changes which SOPA proposed are considered in the context of the measures other governments have taken to restrict access to the internet they seem somewhat minor from my perspective.
China has the world famous 'great firewall of China' which blocks a vast majority of the net. And phone lines to international numbers are notoriously difficult to obtain (they would appear to be reserved for high ranking party officials)
Egypt completely blocked all international and domestic communications during the protests of January this year.
Uzbekistan recently had the government cut access to all Google services without explanation. link
So when the big picture is considered, even if SOPA (Which is dead now, so it is a moot argument) got passed the internet in the USA would still of been freer than most countries. And as it stands now the internet users of the USA are amongst the freest in the world.