Early (and late, actually) in their careers lots of actors do movies they probably regret later. I imagine that on the set of The Great Escape, Steve McQueen must have been a bit chagrined when someone brought up his performance in The Blob just 5 years earlier. Of course, Johnny Depp and Kevin Bacon did some horror flicks early in their careers, too.
The Blob came out during a simpler time - it is hilarious to look at the "special" effects in that movie now. The blob is basically like a big lump of tapioca pudding that occasionally jiggles a bit. And that name - in the 50's you could just use a general purpose word like "blob" to convey a monstrous threat. Zombies was another sort of generic threat - lots of good zombie movies that kept improving on the old theme. More recent horror movies tend to focus on cute personal names for the threat, like Freddy, Chucky or Jason. I can't wait for the horror flick "The Revenge of Todd".
In security, we tend to like to change the names of threats:
- Zombies become BotNets
- Man in the middle becomes "Evil Twin"
- DNS attacks become "pharming"
- Rootkits come back as... rootkits. Hmm, maybe we should call them "phriskers"?
It's better for business to have new threats come along - in the consumer marketing world its called brand extension or refreshing the brand. New lemon-freshened CleanOx with Frammisflooper obliterates latte stains! New threats do come along, and always will - as long as we don't have a technology Maunder Minimum. The heavy lifting generally stays the same, the same security principles still hold.