That's true, the health care industry is a massive opportunity waiting to be tapped. Not just in the western world, even in the developing world, where the incidence of insurance is increasing.
Many developing countries have had none or next to nothing health insurance till recently. But the market penetration of the healthy insurance is increasing (but still very low now). Because of that more people who could not afford advanced diagnosis or treatments earlier are able to afford them now.
Imagine the potential size of the industry when 1 billion people in India and 1.4 people in China (not to mention a billion or more in other developing countries) can afford as good health care as the 300 million in US, the 450 million in Europe, etc