These action hero images get stale after a few years and if you don't reinvent yourself then it becomes hard because audiences want something new. That's why people like Sunny Deol couldn't survive longer.
Ajay Devgn & Akshay Kumar were action heroes in the 90s but they reinvented themselves trying out different types of films e.g. Zakhm, Pyar To Hona Hi Tha, Deewangee, TLBS, Hera Pheri, Aankhen, Mujhse Shaadi Karogi and etc. Suniel Shetty tried but in 00s he depended on mulitstarrer movies.
I just feel Tiger will have to evolve in future if he wants to survive longer otherwise he will end up being like Sunny Deol & Govinda.