Initially, yes, it has been difficult because there has been a negative stigma surrounding e-books. Gradually, the traditional book industry is waking up to the reality of e-books and accepting them as a legitimate form of publishing. Everybody has a different opinion on this. My opinion tends to be a little more cautious than most. I think that's a bit extreme simply due to the issue of crossing the chasm, which I described earlier.
New technologies take time to gain acceptance, and e-books are no exception.
If we compare realistically to the amount of time it took PCs to really take off from being an oddity to having one in every home, which I'd say was probably about 15 to 20 years, I would say that we'll see e-books gradually take about the same amount of time. And within 15 to 20 years, they will be everywhere. But then again, that's just my opinion. And as time goes on, we ll see many improvements to e-books. They will be more interactive, with multimedia presentations, online tests, and so on.