Potential of untapped sports

I know this is not a Chennai specific question but applies well here as well. With over saturation of people with tech and arts degrees looking for a job and literally every street having so many eateries, Why not sports coach as a career.I was looking at untapped areas of potential for growth, I would think starting training centres for competitive sports like Water Polo , Diving , Artistic Swimming , Gymnastics would be great for parents looking to involve thier kids in physical activities , forget getting pro. I understand the upfront investment but atleast you dont have competition.Is that not feasible business wise. Educate me please.