ON the contrary, John Lennon was a useful relieve of peaceful expression that never had a single chance of actually bringing about any change in the world. He was a useful idiot, allowing the masses to feel that there was a real movement for peace and that their desire for peace was being reflected back at them, but he never even came close (or indeed even really tried to come close) to doing anything about the military-industrial complex.
He is fading because his late music wasn't very good and the generation that loved him is dying. The deep state, powers-that-be are the ones who will mourn him, because as an impotent fantasist, he was no threat to them at all while playing the perfect appearance of one.