The place where I see line breeding being a problem among reptiles is, if one of the original subjects carries a defective trait, i.e. Spider Wobble, Desert Females, making it susceptible to a disease or abnormality, then one might consider that the entire line would be predisposed to the same. In the Hobby everyone has come to expect and accept that Spiders have a wobble, though in varying degrees of severity. But, what if the anomily was something viral, versus neuroligical? If a virus came along that infected the original subject and where fatal, one might expect the entire line to succomb to the disease. Potentially a lot of snakes could be lost in a short period of time. If you want an example look up "White Nose Fungus" among bats. They say it may make extinct, the little brown bat in a decade or less, if they cant find a solution.
On the other hand, those subjects from the line that didn't succomb, if any, would continue the lineage, and the line would be stronger for it. Straight up Darwinian Theory, survival of the fittest.
I'm not saying that line breeding reptiles is always safe regardless of how many generations, but I believe it would take significant inbreeding to get to a place where you could point it out as "the" problem.
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