In any case, India will be unrecognisable in 15 years. The change will have been brought about by the people. Even if Modi is PM for 3 terms, this progress would not be due to him, but due to the forces already marshalled and waiting for the moment.
In the early sixties, the question "After Nehru, who?" used to be despairingly posed by people even when Jawaharlal Nehru was still alive. He would respond jocularly, yet entirely seriously, "After Nehru, you!"