So Gamepass will also 100% affect the way games are made, especially AAA. You can already see MMO/GaaS lite being pushed. Anybody who thinks nothing will change is blinding them self - whether the change will be for the worse or better depends on the type of games you like.
I don't see the change to MMO and GaaS games. These existed before and Microsoft added studios to their team, which usually do SP experiences. Sure, Obsidian made Grounded, but that was in development before.
I think some of you are concern about Gamepass for the wrong reason. If you think GaaS will happen (more often) or these type of games will be pushed by GP, then you haven't paid attention. GaaS happen before Gamepass existed and was growing before Gamepass existed.
Gamepass is the reason Xbox supports smaller and bigger games more than ever. As a developer said some ideas couldn't be pitched to publishers, because the question always was how much it sales. With gamepass that's different as some games need to gain subs, while others are just there to keep them.
You know what, something is changing. AA games are coming back with their creative ideas, while AAA games keep getting made. Furthermore most indies are happy about word of mouth thanks to GP and how their game sell better on all Plattforms.