I think it will never happen. At school it's no longer possible, what more in the government wherein corruption is still chronic. Government officials are blind to money that people should benifit.
It can happen, if the people want that to happen. On the other hand, if the people are complacent, then they should also share a part of the blame. If none of the citizens are ready to pay bribes and they are ready to report such incidents to the higher authorities, then I am sure that no one will have the courage to demand bribes.