Common sense says if you can't make a living writing then you need to work a regular job until you can. Sure, volume may suffer but such is life.
I've been working on a novel for years now but fulltime job, husband and dad sort of takes a huge chunk out of my time. Not to mention health issues in recent years have not helped. Still, at this point (and always) providing for my wife and kid comes before my dream. Not that I can't do both at the same time just might take me longer.