User blog comment:Serza5/English Vocaloids - Their Boom?/@comment-5051846-20140716164833

I think the biggest thing needed for an Engloid boom is improvements to how English is handled by the Vocaloid engine. If you're not used to Engloids, they have a considerably uncanny valley quality to them currently, mainly resting in their pronouciation. It's not so much to do with clarity, as it is to do with the fact that where they do fail to pronouce things right, they fall down in a way that a synthesiser would, not a human. Their odd, stilted nature created by the complexity of the English phonetic system makes them much harder for the average person to listen to.

However, we can draw comparisons here to the Spanoids, whose language has a simple phonetic system and are thought of as realistic by many native speakers, but who also haven't had their boom. Therefore, I think a lot of factors are required, included the ones you mentioned.

Another thing to consider would be: we'll also have to reach out the indie music producing community, the main market for Vocaloid. But this community is different in the West to how it is in Japan. Otaku culture is not what you'd want to aim for if you want an Engloid breakthrough, but rather a Western equivalent.