So far, I have found it to supplement what I get. It is not big by any means, but the speculation and holding can be exciting. Waiting for the fork and the later or sooner
halvening will be another thing.
It is possible to make a living with just only Bitcoin but for that to happen you will need allot of Bitcoins to do so. If you do not make enough profit then it is not possible.
Making a one time profit from bitcoin halving will not support you for life no matter how much you earn from it. You will need to have a steady flow of income from bitcoin for you to be stable and make a living out of bitcoin. Otherwise, stick with your day job and let bitcoin be a supplement income.