alt Hacker NewsI didn't read OP's remark as "few people make long use out of e-readers," but rather "many more people have e-readers and don't use them," which I'm willing to believe but don't have any evidence of. At the very least it's likely to reflect the case with physical books. The people who don't read you don't hear as much from.
I don’t have any data, it just feels like a lot of my friends who got kindles for birthdays or Christmas would use it for a week and then then it would sit in a drawer for the remainder.
To be fair, I don’t think most of those friends actually read that much though.