Pre-halving, I was a huge skeptic of this model, but right now I'm in total awe that the model is currently actually accurate as hell. The model is literally being followed like clockwork.
What I'm not sure, is if the model is just really really accurate, or if at this point it's just ended up being a self-fulfilling prophecy. That, and up to what point will the model actually be followed. Because at some point in the future, I expect the model to be invalidated. Regardless if it goes far higher or far lower than the model expects.
I believe the model will be accurate as it is based on supply / demand, stock to flow ... how many coins are being mined, how many are available. It's a broad general model that constantly gets adjusted of course, it is not static.
So it will get updated every halving, which is every 4 years. Beyond that time frame, no one's predictions are really accurate.
The so called "end game" implies an absurd number for many people of at least 10 million to 50 million to 100 million USD, but that is very far away, likely several decades from now.