1. Media hype. The press has moved onto other things. Even worse laser incidents could be happening for all we know, but if the media isn't interested, it won't get reported. The "Green laser scare" seems to be largely a 2005 phenomena.
2. Pilots. I think part of the "problem" was that pilots were alarmed/miffed at the idea that something that cost $50, and was the size of a pen could reach all the way to their aircraft at altitude. We've seen the arguments and math right here that it would take an exceptionaly powerful laser with a very good focus, and an angle that's almost directly head-on, and at final approach to really be a danger. Lasing an aircraft at any power, and at any angle, is still completely and utterly WRONG, of course. I think that the pilots and the FAA were over-hyping the incidents that did happen, and now they've calmed down a bit.
3. The "pranksters". I think that the pranksters with GLP's have learned from the people that have been made example of, that it's not a good idea to point at aircraft. Even if they still have mischevious intent, it's easier to mess with people/things on the ground where there's more chance to see the ruckus or consternation they cause. Pointing at an aircraft is kind of an all-or-nothing proposition. Either nothing happens, and the jerk gets no feedback that the laser was even noticed, or the Police, FBI, and the FAA descend on his neiborhood in force, scaring the crap out of him. The prankster mentality wants to create a disturbance, but they don't want a manhunt either.
4 Terrorisim. The whole undercurrent that fueld the whole airplane/laser scare was the idea that terrorists could use even better lasers to blind aircraft crews and cause crashes. The powers that be have probably decided that lasers will go on the list of "possibles", but that it's unlikely to be used. The terrorists like direct action, and impressive destruction. The laser just dosen't fit into that. Even with a dedicated blinding system better than any pointer, the sky is a big place. It's too easy for the pilot & co-pilot to abort the landing, pull up and away, and try to land elsewhere or later. There's no garantee that they'll be permanantly blinded either. It's too much trouble for uncertain results. I think terrorists would also worry that even in the unlikely event a laser did work, such a crash may not be recognized as terrorisim, and they'd never get credit.