You keep comparing subscription of non gaming services to gaming services like Gamepass which is clearly not the same.How is it any more unsustainable than constantly increasing the price of games per generation citing development cost when the truth is more money is made by selling DLC and other content than selling a game anyway?
In about a decade the business model of gaming is almost guaranteed to be more on the side of selling it as a service to users rather than selling individual software to users. Sony is already ramping up live service games.
Do you not pay attention to the world around you? How many companies like Adobe and others have transitioned from selling software as in individual purchase to selling it as a service? Can you even purchase Photoshop as a normal piece of software you own outright anymore?