Big glamorous movies about underwater treasure/contraband hunts...
...starring big-bosomed actresses...
...that popularize scuba among the great unwashed masses...
come along like clockwork every 25 years or so. First there was Underwater! with Jane Russell, then The Deep starring Jacqueline Bisset, now this thing.
Assuming that Into The Blue is a hit (and I hope it isn't, primarily because I can't stand Jess Alba) it will probably also be like Convoy and the CB radio craze that followed.
It COULD result in a glut of people who get certified, maybe dive a couple of times, then give it up because they were just following a fad and weren't really serious about it ("well I saw it in that movie and I thought I'd try it out, you know, like everyone else; it just looked kind of cool"), or because they belatedly realized that 90% of the time you have to wear a wetsuit over that bikini.
More realistically, you'll probably see a (temporary) explosion in Discover Scuba and resort courses for about a year, and maybe a return of obnoxiously stylish dive gear--only titanium instead of hot pink.
cheers
Billy S.