I believe lack of interest was that it was an incipient breed that needed many breeders interested and invested in keeping breeding healthy genetic stock, as fewer and fewer breeders kept the breed this was bound to happen.I have been trying for years here on BYC and locally to get people interested in these birds.
The issue is not that few people like to eat blue eggs, most people if given the chance between a white or blue, will choose a blue. The issue is how you get them. There are plenty of ways to get blue eggs(or light green) there are at least 5 breeds that can get the job done without breeders having to invest in maintaining the breed.
The basic premise of the breed was very simple. A chicken that could lay like a battery cage hen(340-350 eggs per year) with beautiful blue eggs. Having mostly productive leghorn in them assured most of that production claim. But the breed never took off due to the small pool of breeders and was not backed up by a hatchery like the True Blue or True Green lines..