The game is coming to an end. It was really fun while it lasted. The dollar requirement will come. And within a year we will all learn how much (or little) the ranks will be thinned.
But I still believe that the people who mileage run are indirectly profitable to the airline. These flyers are passionate and are fans of the airline they fly, and they will try their best at work to fly the airline, and try to get others to fly them too.