Only if you're a reckless idiot.
I would actually consider working a real job where I could be made reduntant at any time to be a far more risky profession than online poker.
My dad who has worked for the forensic science service for 40 years was last week made redundant. He was the top earner at his branch and the government shut it down as they are selling the forensic work off to private firms. It's lucky he is of roughly retiring age anyway, otherwise he'd probably have to move to a completely different part of the country or become a teacher or something. He'd survive, obviously, but needless to say his life would change immensely.
If you play poker everything is in your own hands. You're never going to get fired, or snowed out of work, or be sent on a surprise business trip to outer mongolia. You know roughly how much you expect to make per month, on average, and you know it's possible that the cards may not run in you favour for a while, but that's why you gamble small and leave yourself a healthy buffer so that you can always come back.