There's an emphasis on words and stories with books that's difficult to emulate fully with tech. I talk extensively with my son about what we read, and about what he does on the ipad. Those conversations are similar, but qualitatively different as well.

There are also some physical skills that kids develop from learning to turn pages, and handle books.

Books and devices are going to be around for a long time. Kids who develop appropriate fluency with both are going to be in a better position to make sense of their world.