Sure, you may get alot of newbs in the door to try it out and watch a class or maybe try it out for a while. It may tilt the guy that just has never gotten motivated to come in....but long term, how many folks do you think will stay in the dojo based on a TV show?
I'm going to be optimistic about this, too.
When David Carradine died there was a tremendous outpouring of sadness and gratitude, with many folks (here, on Twitter, and at the dojo) saying the show had been what first got them interested in martial arts.
Even for people of the temperament to become dedicated students, exposure is necessary. If one has never heard of Aikido, how could one become interested in pursuing it? I had at least heard of Aikido, but what got me into the dojo was a horse trainer (Mark Rashid), and his book "Horsemanship Through Life." Learning of Aikido from a TV show seems no less valid a path than from a book, or from friends.