Why NTR-Rajinikanth failed to do wonders?

Sr NTR ruled the industry unopposed even when young stars started showing their power. His charisma was such that there was no second coming for him. He continued in the same vein right from the start till the end of his career. He used to transform...
Why NTR-Rajinikanth failed to do wonders? ntr,rajinikanth,sr ntr,kollywood