I don't agree. I read a book a week or more and I only use my iPad. I'm 40 years old, don't wear glasses (no LASIK either) and in the past year I have read over 70 books all on the iPad except a couple on the kindle. Plus I have the iPad Economist subscription and read that too. In the past two days (because I am on vacation) I read one whole book and I'm about 35% through another - all on an LCD.
Again, I'm not trying to claim LCDs are better than eInk for reading... I honestly don't believe this to be true. But I strongly disagree with any one who says you can't read ebooks on an LCD... Because I do this pretty much every night for an hour or three.
And it's not like I'm an Apple-crazed guy either. I recommend the color nook personally. But I do like single devices. When I get on a plane, I pull out my iPad and read, watch movies, play games, listen to music and podcasts. I'd just as soon not juggle two devices... And I like the backlit LCD on the late-night plane flights as well.
If people prefer eInk and,like their Kindles, I think that's great. But I don't agree with all the FUD that gets posted about the viability of LCDs.