User blog comment:Serza5/English Vocaloids - Their Boom?/@comment-5051846-20140716164833/@comment-3076833-20140717141824

For improvements to take place I think it also needs actual interest to balance it out. Miku at her time was fairly new being the first Japanese bank on a new engine, and since then we have plenty of Vocaloids that fans claim to be copying off of her but yet have overall better quality. Not that i'm saying no to improvements but rather I beleive that if Yamaha are going to invest more in improving them then there needs to be more demand for it.

I disregarded new Language Vocaloids here mainly because they're a new market and so I think it's more time that's awaiting them, time for your first point as well as all the leading factors.

As for your last point, that's one I tried to explain in my post; that I beleive that trying to bring what's popular in Japan/Otaku culture, is not going to work for the west as a whole.