There was never much to begin with..all they make is a #6. Why after all these years they haven't bothered to make other kinds of turnouts, especially when they have so many different varieties of Code 55 flextrack, is beyond me.
A long time ago (decade or more) they had a #8. Unfortunately, the mold broke and that's when "we can't justify replacing it, new tooling is too costly" became public knowledge, as David said.
... I imagine they just don't have the resources to do another.
Though a few years ago now, "resources" was not helped by their office manager embezzling over $200,000 to feed her gambling habit. If you want an illustration of the cost of "riverboats" and the tax-revenue darling of easy access to "gaming", ME is, sadly, a poster child.

Given the thin margins of hobby manufacturing we should count our blessings they survived the hit.