Of note: they have separate plot points for e-ink and ebook readers.
And they paint eink as more mature than ebook readers as a category.
In other words, there is/will be more to ebooks and readers than what eink can/will deliver. No shock to the crowd round these parts but it is somewhat surprising to see the Gartner types have noticed. Those subtleties usually pass them by unnoticed.
I do wonder what their definition of mainstreaming is. Cause ebook adoption is going to be perforce constrained to the minority portion of the population that actually reads. So the absolute size of the market is aways going to be small compared to a lot of the other listed technologies/products. When their optimistic projections fall short, as they will, will they blame the product or admit their own failure?
(We know the answer to that, don't we?
)