I have a lot of talented musician friends who have taken a run at full time music, mostly Folk and Blugrass. I is HUGE effort for modest pay.
Another good example is Ryders In The Sky. They do traditional Cowboy music. They have been on TV, the Opry and numerious PBS broadcasts. They have made a living at it for more than 20 years. But, take a look at their tour schedule, number of ex-wives, miles driven etc. and the glory fades.
Still, you live in a country where you are free to pursue your dreams, and someone is going to be the one in a million.