Nepotism is a society problem, start the change in yourself, restrain yourself from taking any advantage from your father or forefathers, then you'll see the change in society and automatically Bollywood will change.
Because in current world every one wants to lift their relatives/known ones career sometimes by connection, sometimes by money, even a shop keeper will let his son continue his business.
Why don't you go to ambani and ask him to give you all his property if you think you are more talented than his son even the names you mentioned have taken help or used contacts at any point of their career, without connection no one can survive in the industry even the names you have taken for example for umpteenth times boney have used his power to get Anil movies, he has removed already casted actors for Anil.
You need to have mentor/god father in this industry, Actresses have to go for affairs, many times they go for compromise, that's the hard truth and that's how real world work. Powerful people will always show their power.
It's just everywhere, Bollywood is just a small part of it, if society changes Bollywood will change automatically.
This nepotism and all is just drama to distract people from real issues you are fool if you fall for this and you are an idiot if you know it's a trap but still fell in it.