What Hrithik Roshan is going through is solely his doing.
Khans are on their peak. The change is bound to happen with others taking over & Khans dominance in the market decreasing. What they do to stay relevant & hold on to their star power is upto them.
You see Salman Khan can't sustain alone with his action star image because people will find an alternative in the action genre & his age will limit him too. The effort can be seen with his Bharat where he wants to go above action image. Infact except that one action scene, he is entirely stripped off his image in Bharat. To test that only he is doing Inshallah. This will allow him to prolong his market for Kick 2, Veteran remake & Tiger till 2022-2023 at max.
Aamir will continue to take his time. If TOH hadn't flopped, then he would have come out more confident. The Forrest Gump remake is his safe zone to encash PK image. With youngsters growing strong (they did dwindle this year but production houses have made it clear whom they will be willing to spend on & give gigantic platform to create next set of superstars), like Salman even Aamir is flexing his muscles to ensure prolonged market before being forced to make a final decision. All cannot take the same decisions or risk as Big B. Giving up lead roles will happen only after they have exhausted their market dominance.
In case of Srk, entire decade went with mistakes after mistake. So it's down to see what he does rather than what we expect him to do. Bollywood clearly proved, more than Salman & Aamir, Hindi cinema directors have zero clue on what to do with Srk & how to present him.