I think their will be a market for both e-readers and tablets. I have them for different things, I also have a macbook air and what I do with that it's not the same things I do with my ipad. Some people say:
"Do you really need to have an ipad when you have a samsung galaxy note 2?"
And yes I do. To read shorter documents for work, take notes, watch TV-shows it is great.
Off course I can do this on my macbook air and my Note 2, but they are not suited for it.
The Note 2 is a great calender, phone and sending texts.
My Macbook air is great for work outside the office, also to watch tv-shows but it has no 3G connection so that is why I use my ipad instead, in my office I have an imac 27".
And when it comes to reading longer rapports and books I prefer to read them on my Pocketbook 622 because it is easier for my eyes and I read a lot faster on it.
The only problem is that you need a really large suitcase.