Many people?
"Wanting" yeah. we would all want that, but for most people it will remain a "want" rather than willing to do so because for most of us btc is not enough to make a living and get extras too.
Moreover BTC is unstable so you need to be really confident when taking that decision  that you will be ok even if things go down.
I really wouldn't suggest it to be honest. Stay with your job and have BTC at the side as your "Hobby" that you enjoy doing.