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My personal opinion is that Carta screens were so slow to become widespread because they were not that much better than the Pearl HD. Of the few devices that do use Carta screen, it appears that only the Carta-based Kindle Paperwhite's screen is considered to be noticeable better than Pearl HD. The other few Carta-based devices have screen whose superiority is not noticed by everyone. Thus, my conclusion is that the Kindle's screen improvement is not necessarily because of it being a Carta but for other technological reasons.
Therefore, many vendors don't like to pay for the more expensive screen and never get the quality upgrade.
Again - this is purely my personal opinion.
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