Read through the article, some very interesting points raised. I'll probably agree with Tilla, in that with Blu-Ray holding upto 200GB there sould be no need to upgrade a physical optical disc medium. However I do think that much content would be available through the internet and people could download games (provided that the internet gets an upgrade to support the high data transmission by then.
And speculating PS5, come on that a bit too farfetched don't you think??