Game Pass has been around since 2017. Xbox first party AAA exclusives have been launching on it since then. You say the content on Game Pass is going to get more expensive? Okay, let's go with that. Isn't Game Pass progressively making more revenue as it gains new subscribers each year also? Microsoft since the start has not changed the price of Game Pass yet. It started out at $9.99, and nothing has been taken away from that $9.99 tier since it launched in 2017 despite Microsoft's acquisitions and despite how many more games they have in development.
They introduced ultimate at $14.99, but did so by adding value, without taking anything away from the previous $9.99 tier. Now even should Game Pass' price go up, it won't go up nearly so much to be a deal breaker. How much would it go up by? $2-$3? Maybe $5?
Game Pass has been in its "infancy" for 6 years now. And I've been saying it from the jump. If Xbox Game Pass come next month is at 29 million, much less at or above the 30 million mark, that's going to be a wakeup call for a whole lot of people despite a year without many AAA first party releases. Game Pass is primarily about Microsoft's first party games, but the third party support has been pretty damn strong as well. HIgh On Life is a legitimately great damn time, among other additions this year.