Originally Posted by
ZeroBG82
Well, Luke tried to do the same for Kylo. But only after a moment of hesitation, which cost him dearly.
The film tells us why Luke heistated. Confronted with a returning darkness, for just a single second Luke believes he can destroy it. It's an institutionalized fear. The Jedi fear the darkness. For just a second Luke stopped being Ben's uncle and was the guardian of the Order first. The movie even explicitly calls out Luke for being wrong in his thinking.
So you're absolutely right. But why Luke failed is the critical element. Luke's Jedi were too much the old Jedi. Luke was too much like the old Jedi. Gone were the days of his radical thinking, outside the box and away from the dogma.
The Jedi don't need to end. They need to change.