Would be nice to see some of the more popular patterns - #15, #66, #68, for example, made in 440C with some other choices in handle material.
Right now they have "packaged" 440C with a very limited selection of handle materials - amber jigged bone, elk antler, some woods, and it seems to available in only a few patterns when it is even offered.
Case does the same thing with CV steel - you want Case CV, you are limited to specific handle materials and the patterns don't change up very often, so it's not like GEC is alone in their practices.
I think it would be interesting to see GEC do a run of 15s in both carbon and SS, available in the same blade shapes and handle materials, to really see if there is a strong consumer preference one way or the other. Though there might be enough of a price differential to make the test inconclusive, plus with so many people already having carbon steel 15s, I suppose the first run of stainless in that pattern would have purchases skewed towards SS by collectors wanting one of each, and those getting them because they are the new thing.
GEC seems to be able to sell all the knives they can make, so there's no real market force that would drive them to produce more 440C if the owners aren't interested in making them.