Why did he walk away? Was he such a coward they he ran away when he was given actual responsibility to bring about change? Also what good does "being etched in the hearts of billions" do in real life. What is it worth? Does it make people's lives better. Being cm he could have enacted policies that would have actually made the lives of his fans better. And last but not the least, being a superstar actor is temporary. 50 years later nobody will remember Rajni. But had he become cm and done something good, he would have been remembered forever. Whether you like it or not, Vijay has the chance to do that. Whether he does it, is a different question though