Well if they could get at the assets it wouldn't be frivolous or wasteful.

Their main bar would be the jurisdictional issue. However if these were 911 victims you might get jurisdiction because the minimum contact Al Quaeda had with the US just happened to be the reason for the injury (i.e. they intentionally flew three jet planes into buildings in the US and the fourth into the ground in the US while attempting to fly it into the building). Where a state seeks jurisdiction against a non-resident of that state the US Supremes look at the "contacts" the defendant had with the state. If there are enough contacts OR the contact was the basis of the action then the Supremes have held the exercise of jurisdiction to be constitutional.

Who knows? It may be feasible.