Personally, I consider the fear to be an irrational one. Genetic discrimination, as it's being presented, is totally unlike something like racial discrimination. There are people who have been ill-treated in our society for decades, for centuries, because they belong to a certain group. Hundreds of people have been killed for that. People's fear of being mistreated because of discrimination, of not being able to do the things that ordinary people can do, is a very real fear.
Genetic discrimination isn't like that at all. The concern is that people are failing to do things that could be for their own good. It's not that they think there are people out there who hate them and want them harmed, but that they might have a financial disadvantage because of it.
Furthermore, the insurance is available. Even today, people can buy a considerable amount of life insurance. If the concern is that you won't be able to buy insurance in the future, I would first ask you this. How much insurance do you need now, and how much have you bought now, before your test? If your answer is that you haven't bought any because you think you're healthy, then that goes back to the fire insurance example. The fact is that people can get the insurance now that they need.