So, i was reading a portuguese (non gamer) magazine named Visão(Vision) from 5-11 December 2013, and there is an interview with James Amstrong, vice president of SCEE where he says that digital only accounts for 4% of total sales.
James Amstrong - contrary to what most people think, only 4% of sales are digital.
Visão - Why ?
James Amstrong - ...anyone who buys a phisical game can play it on other console, take it to a friend´s house, etc.
You can sell it. You can not play a digital game in other console nor sell it...

He also says that Portugal is the country where Sony has its largest market share and he doesn´t think that this will be the last generation of consoles.












