There is a flaw with the subscription model coexisting with super expensive single player games. You need more quicker.....which means cheaper; to keep people subscribing. OR games as a service type games that don’t end so people play them for months; again keeping them, subscribed.
People that really like Sony style games, and that’s a lot of people. See it as the counterintuitive model to what they consider special. For me, my critique of Gamepass for example is not to downplay Xbox fans fun, it’s borne of not wanting Sony to follow suit. I also think if all the major platform holders move to such a model - gaming as a whole will change radically, and not for the better.
There are plenty of "super expensive" single player games on GamePass already. Not sure why they'll suddenly stop? Also even the "super expensive" games tend to cost way less than the typical big budget movie or television series that subscription models produce, yet they still somehow are able to produce them constantly.
Also there's nothing wrong with developers supporting games in ways that has gamers still playing them for "months". People need to get over their silly fear of games as a service. Sony has their fair share of GAAS type games. GT, Uncharted, Last of Us, MLB, they've monetized and thrown GaaS in these franchises and others. They have said that with PS5 they want to go bigger into the GaaS area. There's nothing inherently wrong with that, as long as it's handled correctly. Last of Us having a downright sickening amount of microtransactions and premium MP content didn't stop it from having a fully fledged SP offering. Same can be said for Gears 5. And Forza Horizon 4, easily the best racer in a long time, has a gargantuan SP offering you can fully experience without ever needing to jump into MP. Even the GaaS elements there can keep you engaged and playing the game without ever needing to pay another penny or leave single player. This is a bad thing?
It's the same type of fear people had with EA Access, how a year or so after release we were going to have every single publisher locking their content behind their own subscription and now years later turns out, nah, nothing really changed at all, just an optional service. You're afraid that a model like these will stop Sony from spending five years making a one off single player game you can finish in a weekend and never touch again. There's no reason these can't coexist, they already do on GamePass, they already do on movie/television subscription services.
Sony is going in on this too. Can't wait to see loads of people suddenly loving the idea then.
Also for the amount of people you claim that love the type of games Sony makes, those numbers still pale in comparison to the people who buy multiplats and GaaS type games, and even a majority of PS4 owners didn't buy most of Sony's offerings. They sold a lot of games with bundles, and a great amount of games outside of those bundles in some cases, but even the best case scenarios like Uncharted 4 or Spider-Man sold to what, 1/10th of the userbase? 1/5th?