The real question is: does Sony need something like GamePass? And I think the response is no.
They are very successful and let's be serious a minute, if Microsoft is doing what they are doing, it is because they are the underdog and they need to appeal to a maximum of people.
Sony on the other hand is leading the market, constantly releasing games acclaimed by the players and critics. Sony's PS4 output is (was) incredible. Time will tel for the PS5 but they are on a very good start too.
As for "game quality ‘will deteriorate’ if it adopts Game Pass-style strategy", I have to disagree with him.
Ok GAF don't flame me, now that's just my personal opinion:
Quality is NOT related to how much money you put in a project, or Anthem would be an amazing game for example.
Now I can understand that games like The Last of Us II, Uncharted 4 or Spider-Man are big investments but it doesn't mean those are good games by default. And imo Sony is hit or miss.
Uncharted 4 is beautiful but the story is meh at best. Currently playing TLOUII and same, it is looking incredible but as soon as they start to talk about "rate our kiss from 1 to 10", I'm sorry but it's bad writing.
Spider-Man start to be good at 70% of the game, when you finally fight a few boss. Miles Morales is boring and cliché.
Most Sony games are 12 to 15/20. They're not bad games at all, but they all have something that prevents them from being true masterpieces. Most of the time it's the writing.
I know it is the most difficult part, and I'm really glad Sony is still releasing single player games of this caliber and I'm gladly buying every new exclusives, I just hope they improve on that part.
Special mention for God of War and Ghost of Tsushima that I really enjoyed.
So yeah keep those big investissements, but also focus on smaller, riskier project too (like Returnal). Nothing prevent you from doing a SonyPlayPass.