First it was Ranbir then Ranveer then Varun so yeah next one SSR and then Anils son forgot his name it goes on and on. Superstar will be clear in next 10 years 😉
But SSR has chances to win best actor depends on his PR after Dhoni releases. Dhoni is a highly popular sportsman and still around doing his job so audiences pay more attention to Dhoni himself than for SSR. Its not like they will run after him and call him Dhoni.
Also it seems that Dhoni is a superhit so there are not that many competitions in the popular choices but jury can be difficult there are many good performances.
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