Recently, Government of India has asked Supreme court to form a committe to look into matter of applying creamy layer criteria in reservation to SCs and STs just like we have for OBCs. Creamy layer put economically strong persons out from reservation.
Reservation to SCs and STs were given not because they were not well off economically but because of discrimination they faced past 2000 years. Untouchability was the main issue at that time however today finished on paper but still prevalent at some places. If a person enters in job no doubt he become well economically however he still faces stigma of discrimination in promotions and also in dealing with his/her work.
This is just like women demanding reservation everywhere not because they are not strong economically but because they are discriminated on the basis of gender. So government need to first have some data about discrimination they face in Jobs, educational institutions and other places. It should act accordingly then.
However for now government can end subsidies provided to economically strong SCs and STs. Because once they enter into job they are well for paying LPG cost, Higher education cost of their childrens etc. Ending subsidies is correct step now rather than ending reservation for well paid SCs and STs.