Also be aware that going digital only reduces your buying power. You're restricted to digital only outlets, and for some titles, particularly the smaller ones, I have only ever seen the PlayStation Store carrying them, so you pay whatever they list them at.
With a disc you can still take advantage of digital sales, plus grabbing discs when on offer or even second hand.
A key example of this is pre orders. Sony will want £60 or so digitally, whereas on disc you may pay £40 for pre order as Amazon, Argos, game, Tesco, asda, shopto and others compete for your order. So far Sony have been restrictive over availability of digital keys via non Sony outlets and I don't see this changing. They have a monopoly on digital ps4 sales. Microsoft isn't so bad as deals do crop up for keys on cdkeys and others, but it's a similar situation.
Personally I have too much of a backlog, and also too many bad launch console experiences (2 x red ring of death xbox 360s and a yellow light of death PS3) to jump right in, although admittedly this generation have resorted confidence in hardware build quality.
Happy to wait a year or two.
