Maybe I am too young to remember skymarshalls. However, we will probably see armed guards in and around airports. I don't like the idea because it makes us feel like prisoners when we are the victims of the attack. Also the costs will most likely be passed on in form of fares or taxes somehow. Airlines will likely use this time to cut routes and merge passengers from different flights to a specific flight.
In regards to security measures mentioned above, everybody seems to be sold on the idea that the weapons passed through underpaid and possibly poorly trained security scanners. What about the compromise of ground staff or airport personnel such as airline cleaning crew or baggage handlers? They could have loaded the plane with enough arsenal.
Also, I believe the bigger security measures is more for peace of mind of travelers and to show that the government and FAA is phsyically doing something. To quote a French proverb- "why buy a lock for the barn when the horse has already been stolen?"
In the end, it doesn't matter how many locks you have on the front door if you leave the window open.
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"Fly me to the moon and let me earn alot of miles."