I don't understand why anyone would prefer a digital game over a physical one. When you purchase the game, you don't actually own a copy of the game. The only thing that you do own is the license to DOWNLOAD the game. You cant lend it to a friend or sell it to a store or another person (Hence, you don't actually own it).
Sony allows you to share all of your digital purchases with one of your friends for free. That is the only reason why I purchased one video game digitally. Gaming will die when there isn't a physical gaming system or games to purchase at a store.