Well, Janet Napolitano says they're working on it:
We are moving towards an intelligence and risk-based approach to how we screen. I think one of the first things you will see over time is the ability to keep your shoes on. One of the last things you will [see] is the reduction or limitation on liquids.
Freakonomics covered the ridiculous toll exacted by Richard Reid's failed shoe-bomb attempt:
Let’s say it takes an average of one minute to remove and replace your shoes in the airport security line. In the United States alone, this procedure happens roughly 560 million times per year. Five hundred and sixty million minutes equals more than 1,065 years—which, divided by 77.8 years (the average U.S. life expectancy at birth), yields a total of nearly 14 person-lives. So even though Richard Reid failed to kill a single person, he levied a tax that is the time equivalent of 14 lives per year.
(Hat tip: Katherine Mangu-Ward)
The Dish 