As for the argument about Physical Versus Digital Copies Of Video Games, one of the biggest points that is persuading me to buy and start a digital library instead is that manuals are soon to be gone from physical copies. Although gamers could print the manuals, it's still a waste of ink. Also, printer ink is expensive. As much as I still love a physical copy, the game just doesn't feel complete without an actual manual.
As for handhelds, I already have a digital collection for PS Vita. Now, I'm saving money to get the system. There are a lot more games available on the PS Vita other than the physical library you see in stores. When you do get the time to browse around or start using PlayStation Network, I would strongly suggest looking through the libraries as some of them are even Cross-Buy Platforms, albeit limited.