u/HODL2468

I have the feeling that there are less and less real coloring books on the market every year. With real books I mean by a real publisher with proper paper, not Amazon printed. Also, there are only some artists left that produce new books like Kerby Rosanes, Hanna Karlzon, Rita Berman, Mythographic, etc. And they become less every year, too. Why is that? Is the coloring community getting smaller, is the trend over?