Which is further enforcing his point. PCs can get away with it because sales are guaranteed. Look at PSN's digital offerings. While they've improved with PS+, they're still nothing special. Take something like Sleeping Dogs, I'll tell you the cheapest it's been on Steam, and you tell me the cheapest it's been on PSN digitally, and we'll see who wins.
I also doubt Gamestop will go anywhere. Someone's got to sell those consoles, and the whole Amazon US/Nintendo debacle should put Sony and MS on notice. At least with Gamestop, they can barter and say 'This is ALL you sell, so you have to do this'