I'm positive it's going to be a third thing that will be happening in the future.
I agree. Now that the airlines have decided they won't use force to remove someone the other passengers will just have to do it if they want to ever see that plane leave the gate. If someone else volunteers to take his place look for a lot of people to trip and "accidentally" hit their elbows with his face during the flight. He better make sure he's in a window seat. I really despise people who think they are better than others.
I doubt it will take more than one incident like that to convince all problem children like dao that leaving the plane peaceably is a far better thing than getting their ass kicked by fellow passengers because he feels special and better than them.