Yes, now that we know airplane hijackers can do other things than just fly to Cuba, passengers will be more determined to ensure they will never get control of the aircraft.
But a dramatic event in real life on the order of the attack of September 11, 2001, which by its very nature cannot help but receive vast publicity... runs the risk of inspiring copycat attacks in large numbers.
I don't think so.
We got copycat hijackings in the old days because it didn't take much. You get on a plane and announce you're hijacking it. Everybody does what you say for awhile because they don't know what you'd do and they're willing to spend aviation fuel and long hours of a few hundred people's lives to avoid problems. Then after it's over either you're in a country that lets you go free or you're in for years and years of legal problems. People who're interested in avoiding years of legal hassle and jailtime won't do it, but people who don't care about that or who don't think ahead might do it.
But now the stakes are higher, so people won't cooperate. Try to hijack a plane and they don't just say "Yessir Mr. Hijacker, what can we do for you in the short run before you get caught?", they try to kill you. You have to stop everybody who tries to kill you, and get into the cabin and kill the pilots, and then pilot the plane yourself from that point on. It's a great big effort with no help from anybody.
If we publicised bank robberies we'd probably get copycat bank robberies. When I looked at the online police records for my town for a couple of months I found a lot of people reporting suspicious guys on the street, and a few auto thefts and such, and two bank robberies. People would go into a bank and demand money, and they'd get maybe a few thousand dollars and leave, and then they'd get caught. You don't need a gun to do a bank robbery, all you need is a piece of paper that says "This is a stickup give me all your money". Maybe people do it as a way to get into jail. It looks pretty easy. If you actually had to have a gun, and you had to shoot a guard, and they had alarm bells and police sirens and people actually shooting at you until you surrendered, I bet it wouldn't happen nearly as much.