"Was there ever a "X killer" that actually killed the X?" I would think Dell, Amazon and Wikipedia would this idea. That being said, I would define "X killer"

"Was there ever a "X killer" that actually killed the X?" I would think Dell, Amazon and Wikipedia would this idea. That being said, I would define "X killer" as an organisation that completely dominates it's field. In all of the above cases, they managed to beat their competitors in price point and range.