I doubt VR will ever replace dangerous sports. You get adrenaline rush precisely for the fact that you realize it's dangerous with a real potential of getting killed or wounded and the fact that you get away with it. Sitting in an armchair with no such potential consequences might get you some thrills but it's nowhere close to the real adrenaline rush. I don't actively pursuit this feeling, but driving motorcycle regularly had put me in several close calls over the years giving an adrenaline rush I realize can not be replicated in the safer environments.