JD, you always seem to agree with everyone
I think the key word here is “Americans”.
People will die over this, they will be the Government Informants that were listed in the released documents. Although not Americans, I would think it's safe to say some of those people will die as a result of this CLASSIFIED information being leaked and those people being called out.
This has potential to do long term damage as it will be harder for our country to get informants because they will now have to worry about their name being leaked.
You asked: Are terrorists more motivated to kill Americans today than they were last week? Probably not, but it will be harder now for us to gain trust of someone willing to provide information.