Likewise, what requirement would DNS provides outside the USA have to cooperate with any blacklisting? I would image most would refuse, citing the additional effort required, lack of jurisdiction, and general inanity.

Thus, affected folks who are savvy enough can switch to DNS servers outside the US, which presumably also includes the group of genuine copyright infringers whom these bills are trying to target in the 1st place. Which also renders these bills ineffective at their intended purpose too?