As an owner of a library of books, who has had to move upstairs to the third floor, I would say ereaders are wonderful. Unless you have a large home with a room you can dedicate to just books, ereaders are the way to go. If you have to move(ever) you will be much happier moving a thousand books on an ereader than in a series of boxes(my back still hurts just thinking of it).
"I would rather be exposed to the inconveniences attending too much liberty than to those attending too small a degree of it." Thomas Jefferson