You still need a harpsichord for harpsichord music. In this century, cars replaced horses. But cars aren't much use in rough, roadless country. Many technologies survive their replacements that way. Live concerts have survived recordings.
Pens survive word processors.
Electronic books will soon have features you never imagined in paper books. They'll have colored pictures that move, spoken words, and background music. And that's just the beginning. Computer books will invite reader participation. Straight-through story lines will give way to mosaic elements that readers can manipulate.