The campaign to encourage Mandarin in Singapore was, of course, directed at the Chinese: it was not intended that it should replace English as a lingua franca. I have corrected a phrase in a recent post that suggested otherwise. Even so, has it placed the Chinese above other ethnic groups in a way that the humbler Hokkien and other vernaculars did not?
According to Singapore census figures quoted at Wikipedia, the battle is being won. During the 1990s the language most frequently spoken at home among the Chinese resident population ceased to be a vernacular and became Mandarin.