Joyce's chin will crack all at once. He can't keep eating bombs forever. It probably won't be against a slugger like Makhmudov, but against someone no one gives a chance of doing it.
They've said similar about all kinds of guys. Pretty much impossible to make a prediction that hasn't been made before. At least a realistic one.
I said the same thing about Kownacki, and while Joyce is superior to him a similar fate will eventually befall him.
Kownacki lacked any other skills except good workrate and a solid chin. Joyce is far more nuanced and most importantly taller
Doesn't change the fact you can't eat bombs forever. The guy is also 37, age is nipping at his heels.