Well, for a little perspective, if you read the FBI report, the threat is actually listed as LOW, and the FBI has no indication either that terrorists have got their hands on a military grade laser, or that there is any specific threat concerning laser attacks. The warning was general, and not at all immediate.
One of the biggest problems with warning dissemination is rumour control, and the media seem to have taken this and cranked the rumour mills up several notches. The fact is while it's a potential threat, there are lots of things that are potential threats, and as threats go, this one is pretty marginal. Lasers of all types have become common in the West, and there's any number of reasons for laser hits on planes that don't require vast terrorist conspiracies to explain - the leading one being locals idiots who think it's funny to aim at planes.
Frankly, if the terrorists did get hold of a first-rate military grade laser blinder they'd be much better off to put it to work knocking out Coalition optics on the battlefield in Iraq or Arghanistan than trying to smuggle it (these things are portable yes, but not that small) into the US for the dubious chance that they might crash a plane with it.