I feel that things have pretty much stabilized at this point. I've run several Gecko Time articles about leopard geckos and the market. The breeders I've asked feel tat they can sell what they produce. I produce about 60 leopard geckos a year. I have 6 left from the 2016 season and they will be gone this week. I think the most important factor in maintaining a decent leopard gecko market is educating customers and potential customers, mostly in terms of using proper husbandry, thinking very carefully before breeding and then doing it in a responsible way (healthy geckos of known genetic background), and, most importantly "you get what you pay for": the $10 teeny gecko has a lot worse chance of reaching adulthood than the $30 well started juvenile.
Aliza