I agree with Wino. Having the flightdeck in-accessable from the cabin will definately be impossed on future A/C designs. Short term, although I disagree with it, is to have armed, highly trained skymarshals on-board A/C. As for OTT security at airports....It's never to much, for the time being to restore confidence of the flying public that this industry is SAFE. Safer than it has ever been before.
Also, for those of you that do not get CNN, the FBI still believes that there is a present and credible threat of this happening again soon. Terrorists may still be sitting in airport lounges, terminals, and at home waiting to board flights that have been scrubbed.
Let's have overkill for now. It will give passangers piece of mind.