It's not impossible, I guess, but it's hard. To have sustainability in our quality of life, we should also have a source of income that can sustain us. The cost of accommodation, food and water, electric and water bills and other bills such as phone and internet bills are the things that our income should afford.We should take these things into account if we think of foregoing a traditional job and concentrating on Bitcoin. Lucky on those who are living off Bitcoin and does not need an 8-5 job. But for us who are not so lucky, we have to grind and work hard.
I don't think so you are hundred percent right because if someone is trading in bitcoins for a year or so, he must have collected a good amount of money considering he is a skilled trader, I think bitcoins is sufficient for him. Earning bitcoins is better than many jobs.
My traditional job couldnt provide me enough income to pay internet bills, house rent, light bills and a lot more. Even feeding was hard. So, I got into bitcoin full time, and at least I can see some good changes. I can at least afford to pay some bills, and most importantly for house rent, cause I need shelter. So bitcoin is really good, if you can find a good option for earning a decent amount.