Read my comment again. I agree it was necessary at some point. But not anymore. Does the third generation need to take these benefits? Do you think the children of a Deputy Commissioner, or an MLA are being discriminated against? They are the most privileged already with best educational opportunities. Why do they need reservation for college admission?
In the absence of a system to correct for historical and ongoing injustice, you get the English system where 73% of all government jobs are held by people with the generational wealth to attend elite high schools (who are otherwise only 7% of the population). And then you end up with the horrible mess of class-anxious governance by mediocre-but-born-rich folks that is the current disaster England is living through.
The reservation system needs tweaking and excluding privileged people from taking advantage would be a good start. There's already the creamy-layer criteria for OBC reservation, the same can be applied for all categories.
The fact that a small minority is able to corner the benefits of reservation when the overwhelming majority is left out is not a pursuasive argument that reservations are no longer necessary.