There are going to be some potentially horrendous unintended consequences, in addition to the possibility that people in other countries could see this as a precedent to bring lawsuits against our country for actions taken by American citizens overseas, including the military.
However, the one that I think has been completely overlooked is that the bar has been set so high for anyone to actually get a case into court against someone like Saudi Arabia that the legal costs could bankrupt them. What I mean is that if one of those 9/11 families were to try and sue Saudi Arabia that they could potentially lose everything if they either lost the case or they wasted years trying to get a case together only to have it thrown out of court for not meeting the strict criteria needed to even get their day in court. And don't you think that there aren't going be dozens of law-firms just waiting for this law to pass for them to swoop down on these families and take them for everything that they're worth all in the hope of some future win against a bunch of rich Arabs. With all of their hatred of personal liability lawyers, I just can't understand how so many Republicans could vote for this.
No, in my opinion, this is nothing more than something that the Congressmen and Senators, from BOTH parties, are going use during their reelection campaigns so some feel-good, but totally worthless piece of trash legislation. It's pandering at it's worse because it could lead people into believing that they're finally going to be getting their "pound of flesh" only to learn that in the end they're the ones who will be losing for the second time.
Anyway, that's my humble option, for what it's worth.