I'm quite happy with my Kindle (K1), but I think the guy has a point.
The screens on the current ereaders are too small for nearly any book that isn't a novel. Today's ereaders are not suitable for
- Textbooks
- Technical Manuals
- Business Presentations
- PDFs of 8.5"x11" pages
- Etc.
Also, a color ereader would be great. There is a reason so many traditional books are color; they can provide information better than their black & white conterparts.
- art books
- travel guides
- magazines
- cooking books
- children's books
- etc.
One day I hope to have two devices. I want a big color ereader that can display just about anything, and I want a small ereader that I can fit in my pocket, so that I can carry around a couple thousand novels with me at all times.