It'll never not annoy me because part of the reason you bring in aged all-timers is to have their successors rinse every bit of knowledge they can manage out of them and we had zero planning or contingency in regards to doing this, although I'm sure Kobbie is, at this time, taking in what he can like a sponge.
I made a number of posts when Casemiro came in hoping there was a plan in place for others to learn from him and have the collective bar of midfielding at the club improve, and then ETH turned into the Mad King. Amorim lacked comprehension so we lost invaluable time levelling up the midfield there, too. It's disappointing because that's a large part of how Casemiro would have been worth every penny outside his own direct contribution.
We're in for a tough time if he does go as whoever comes in will be under the microscope and that know how and nuance will be absent, so we're going to have to try and compensate, but as Real have shown, that's incredibly difficult.