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.
You're right, it simply is not possible for a lot of people to even get close to making a living with Bitcoin, and I can't think of any positions I've heard in a Bitcoin company that pays what a normal job would. I could very well be wrong, but any position within the cryptosphere paying over $20,000 is basically non-existent.