This argument relies on the fact that the concerned person should not rise above ME in status. Perhaps you should look at it as a country and see that the upliftment happens at multiple levels across multiple generations. A person who gets a job as a clerk in the first generation gets his kids the education to make him an engineer. This kid then wants his kid to grow up to be a civil servant.

As it has been mentioned in the thread multiple times, reservation is not an economic upliftment program. It's a social upliftment program to ensure representation at all levels.