I already game pretty much Digital Only. And with Australia's stone-age internet, that's saying something!
That said, going digital only would be a stupid move. Plenty of places who won't be able to get games if it can't ship them in physically. And I still remember the nice feeling of coming home with fresh shiny boxed copy of that game you've been waiting for. I'll get a PS4 eventually and I'll probably buy physical games for that.