This is cynical past the point of healthy. There are plenty of sectors that would be revolutionized if smart people focused their attention on them.

You don't have to cure cancer; that's absurdly binary and based on fame. You can do less sensational things like invent a device that improves patients' lives using modern robotics and sensors. You can design a system for Alzheimer's patients that incorporates your knowledge of big data sets. I can't dream of all the things to improve, but your domain knowledge is probably tremendously useful in all kinds of fields.