What on earth are you talking about. Some dudes rock the bald look by choice. Cancer will literally kill you if you don't pay to get it treated.
What's far more likely is that the 'cure' for baldness will be the merger 21st century technologies including tissue engineering and genetic modification to make perfect and long lasting hair follicles for automated transplantation.
The argument you're presenting is akin to saying that people in the 15th century didn't go to the moon because there wasn't an economic purpose for doing it and not because there is no way to go to the moon with craft made of wood and iron.