Conspiracy theory here: What if, all of those years ago when Microsoft talked about doing something similar, they added a unique key to each disc. This would have allowed them to implement something like this later when the time was right. /Conspiracy theory
To be serious, in this patent looks like you might need to keep an extra Xbox one or Xbox series X around to continue accomplishing this. Without a unique key, I don't see how it would not be exploited. I wouldn't say I like this because I put my Xbox One in storage and may give it to charity. The great thing about BC at the level of Xbox One to Xbox Series and PS4 to PS5 is that it makes the old consoles redundant. I hardly have a reason to keep mine around anymore.