Not good. They will totally eliminate the Sinhalese culture. Even in their own country the actual white British resent having to live under migrants. London is a goner, Birmingham is dead, it's all Muslim colonies. If they were ruling us they would already have appointed a You Know Who.
What went wrong was not the independence, but having the wrong people to govern us. By the time the British left us they had already made an upper class of their own goons who converted to Christianity, and were privileged for the same reason.
Today's Catholics are mostly common people who have dropped down with time, but still that privileged class have the land in Colombo.