If you are a poker pro, you can easily live with bitcoin poker.
a trader? Ok, you can trade alt and btc daily for money.
a gambler? Yeah you can earn money from gambling.
So Earning a living with bitcoin is very possible.
gambling for living? it's plain stupid,with gambling you could lose your money everytime and then what happening if you just out of money because losing on gambling,you'll be living to be a poor and can't even afford for the daily needs so actually gambling with bitcoin can't be used for living or fulfill your needs