It's true that the vast majority of people that lived in ancient times lived and died in obscurity.
It's not true, however, that the Jesus of the fables was just another regular Joe that we would expect no one outside of his circle of followers to have taken notice of. Plenty of people that would have been less famous even then were nonetheless mentioned in some surviving document written by a contemporary. It seems awfully strange that a man who did signs and wonders, who astounded and confounded the wise and powerful, who fed multitudes in a miraculous fashion and so forth and so on, wouldnt show up as such in the historial record until roughly a century after his death.
By itself this is not conclusive either way, but it certainly doesnt strengthen the case for a historical Jesus. Not by itself.