:shrug: that would be a very bad problem if it happened.
Removing it from the spec would be better for precisely this reason, but making it harder to use is the next best answer. Bing AI's browser restrictions for example are a pretty big restriction on the service -- that comes with penalties that will discourage many sites from going down that route.
If Google also drops attestation for synced keys then it would become even harder to use attestation, and harder for Apple to go back on its decision. But yes, you're right, it would be better to have stronger guarantees about the future.
Removing it from the spec would be better for precisely this reason, but making it harder to use is the next best answer. Bing AI's browser restrictions for example are a pretty big restriction on the service -- that comes with penalties that will discourage many sites from going down that route.
If Google also drops attestation for synced keys then it would become even harder to use attestation, and harder for Apple to go back on its decision. But yes, you're right, it would be better to have stronger guarantees about the future.