Other Major Airlines ?
AA, UA, SW, BA, DL, LH etc. ALL have very big domestic operations which will recover first. International routes will suffer most and will be the slowest to recover and as CX has not one domestic route, well, you do the math..
I believe your 20-30% cuts are extremely optimistic for CX as additionally the vultures from the North are circling and want a bigger slice of the international pie.
I hope I'm wrong.