I must admit, I too miss the good old days of reading the manual prior to playing the game! Manuals are irrelevant now. Booooooo!
If you think digital wont overtake you must be missing a few... It takes about 10 years for a new format to become dominant. Betamax, VHS, DVD, Blu-ray (will prob. not make it
) and Digital.
I would bet any money that digital film rentals have overtaken physical rentals, you've got sky, virgin, BT, Love, Netflix plus more versus Blockbuster (nearly bankrupt) and indies, once Blockbusters are gone digital will account for 99% of all rentals.
Steam and other download services account for a high percentage of sales and DLC is about 99% download. Some games are never released on physical formats and already account for most of the best selling games with Angry birds series downloaded through different free-to-play and fully paid models running at 1 billion + downloads.
The savings on contracting out disc writing and packaging and the lower risk of piracy/theft, the move is inevitable.