What does mrs. Klugman say vanished forever? What do you think is the point of this interview?

Mrs. Klugman says worry vanished when she moved to Mars. The interview was really an advertisement, kind of like today's infomercial. The subtext is that earth is a toilet and anyone remaining is "special". Being special was not a good thing. The interview is an example of how humans discard things, even their planet only to move somewhere else and do the same thing all over again. Real estate and money are the major motivators.