Furthermore, eBooks just aren't a very good format for many types of books. Fiction that's 99% flowing text--and some non-fiction? Sure. But even though I buy $1 and $2 eBook cookbooks when there's some special going, it's mostly a lousy format for that sort of thing--much less "coffee table" books in general.

eBooks have ended up being a sort of niche as you say. Not a wholesale revolution of the publishing industry. Probably not that much of a bigger deal than print on demand at the end of the day.

TBH, a lot of the same forces that helped create eBooks have actually limited how many books a lot of people read. I'm pretty sure I read as many words as I ever did but I read fewer books.