Aside from the pilots and flight attendants, having tried to deal with issues directly with the airlines in the past, I fear they are of the same thinking ability as the TSA. They need to step forward - NOW.
What will happen? Frequent travelers will become less frequent travelers. Suddenly, a pleasure trip or a vacation will not be a way to lower your blood pressure. People will start to look at the alternatives. And use them.
Video conferencing will become used more often. If the destination is a day's drive, people will opt for the car add it up - 2 hours before your flight, two to 3 hour flight, getting through the airport, grabbing a car...what's another couple hours?
Unfortunately, this will not bode well for the airlines, hotel business, rental car business and it will impact the oil business. Unlike after 9/11, that business will not return. Companies that pay for travel won't mind if they see their travel expenses significantly cut.