You see a long time ago when I was fresh out of college and out on my own as a single guy I had to get a two bedroom apartment just to hold all of my books, comics, movies, video games etc. The walls were literally lined from top to bottom with shelves. Now I can hold the bulk of that entire room, minus the movies, on something I carry on my keychain. If I factor in the movies, the room, all told, would still be small enough to fit in my car's glove box.
There are things I prefer about physical media to be sure. However, if I am kinda amazed anymore to think about just how much media you can fit and enjoy on something as ordinary as your cell phone. I know with my cell phone (Xperia Play) I can read ebooks, read comics, watch movies, listen to music, play old console games, and so on. When I was in high school it would have been unthinkable to be able to do all that on my phone and even crazier to think that all that stuff would fit on a card smaller than my thumb nail.