It's usually a combination of factors (though some here think it's only because of this). If I say that it's 33% because of fatigue, 33% because of the route and 33% because of Urshka I'm probably closer to truth than those saying only about one reason.
Pogi was still averring a minute ahead of everybody, per stage, and he is not injured. Medal is almost a given, gold a realistic opportunity. He could still take Urška with him, on holidays at Olympics. Murn was favouring him to the extent he was apologizing and preparing the public not take Rogla, just to support Pogi to the fullest. Rogla, if healthy, would obviously go, but still.
Anyway, it is what it is, a missed opportunity, unless i guess Urška makes him go. But likely Pogi too young and stubborn for that. So indeed lets rather move on.