Do you need to? It's okay to be passionate about things that aren't profitable.

But if you're looking to build a career around your passion, I'd recommend introducing yourself to people who work in that industry. This will help you learn more about the industry, and possibly identify pain-points in that industry which you could seek to address with a business.

There's no saying you can.

For every American Idol stars look how many people show up and never make it on the show.

Passion + Ability + Luck ~ Success

Also, this is an interesting talk about what it takes to start a movement.

https://www.ted.com/talks/derek_sivers_how_to_start_a_moveme...

Every answer to that question is different! For most people, however, it will involve tasking risk, probably a lot of risk.