No doubt SQ would like open skies everywhere, why not? They have no domestic market for anyone else to cherry pick and are a small nation fortunately situated at the crossroads of Asia.
There is competition on the route already. Singapores arguments don't mean much. They have simply seen a lucrative route and wish to cherry pick it.
Why don't we see them demanding access to the Syd-Nou route? Or the Melbourne-POM. Darwin to Dili return? Or a thousand other thin, profitless routes? They can get stuffed as far as I am concerned.