Market forces will dictate prices in relation to other sources not cost of production. Prices unlikely to come down. Limiting input resourses for such products will in all probality keep this as niche product.
The notion that you can make inroads into global use with such products in aquafeeds is a falacy, just as insect meal is which was in vouge some three decades ago. Academic cycles for grant funding seems to be the order of the day!