The problem here with the "enhanced" security measures is the same as with law enforcement everywhere. They are always at least one step behind the bad guys. While we are seeing alleged measures to combat known methods of destroying planes, other methods are being devised and tested, totally unbeknownst to airline security authorities. It will require another bit of luck in intelligence gathering to prompt the discovery of those new methods, or another incident in which the new methods are employed or tried. Then the cycle begins again. So the current "security measures" are probably a waste of time in that the new methods are already in development just as the old methods have been abandoned. Profiling works. Ask El-Al.
My friend went to Israel on EL Al with a mission trip in early 90's. He drove to Airport with a guy who was and is a lefty liberal, who learned Arabic in College, travelled to Egypt once and is a Peacenik. The questioning was fascinating of this guy: "How was the weather in Hartford? Took 84 or 95? (4-5 questions in Arabic). Any friends in the Middle East? Know anyone in Egypt? Spoken to anyone in Israel this year? How did you like Egypt? Etc. Very curt, like a police suspect.