Nepotism is unfortunately an integrated part of the entire South Asian culture. It will remain so until the end of the world.
The history since 1972 - today for Bangladesh as a separate state tells a different story, and I have closely studied each year since 1972 - today more than any human being you can ever meet, let alone in this forum.
When Hasina's father, Sheikh Mujib, was killed during a late-night coup on 15 August 1975, India did nothing despite having a 25-year defense treaty. Indian ambassador to Dacca was even in close communication with the new regime, who promised them that Bangladesh would not do anything against India. Instead, India banned any news about this killing in India under extraordinary emergency power by Indira Gandhi. I personally know the people who killed her father Sheikh Mujib. However, all subsequent Bangladeshi rulers have been more or less India-compliant.
The state of Bangladesh has been an Indian project since its birth, whether Bengalis like to hear it or not. India is their biggest neighbor from three sides of their border with the Bay of Bengal in the south. Anyone who comes after Hasina will be no different unless Bangladesh changes its name. lol