Obviously Americans have no qualms about artificial foods or "inferior" substitutes, but it has to be cheaper. Paying a premium price for something that's even a decent facsimile guarantees that the product will remain niche.
I also am disappointed there was no iteration or improvement of the product over time. There was clearly room to innovate or make it taste better - it feels like the product hit, there was some excitement about the novelty... and then they didn't capitalize on it by pushing new variations and updates.