Amitabh Bachchan from 1977 to 1993 was a phenomenon no one could dare to challenge and SRK from 1995 to 2013 been undisputed box office King. Hence, they are still referred to as Shenshah and Baadshah.
SRK is in his career's wordt phase as an actor as his films like Fan, Raees, Jab Harry Met Segal, Zero have been disasters. SRK seems to have put a pause to recuperate from the situation as his 2 years in the making dwarf drama with never before done VFX, Zero failed.
He didn't come up with any announcement for his next and there are speculations. As a producer he made Badla with Amitabh Bachchan and Tapsee Pannu in the direction of Kahaani fame, Sujoy Ghosh.
As part of promotions, SRK and Amitabh for the first time sang together in a selfie video or a video-fie. Madhavan termed it a historical video and we agree too!