Why do we need Yale NUS?

We have two of the world’s top universities in NUS and NTU, why is there a need for a Yale NUS? Are we going to have Cambridge NUS, Harvard NUS, MIT NTU, Oxford NTU? Should not the effort and resources be poured into NUS and NTU to make them greater and better universities? By having joint universities, they are going to draw more of the limited good students we have and will only dilute the