To share an experience from a competitor ..... SQ has a similar style breakfast on their early evening departures from SIN, and a single meal only on their late departures. So essentially on those flights departing around 9pm you get a full 3 course meal and in the morning (if you want) a pastry, some fruit and OJ/coffee/tea. It is a very basic breakfast, but when my body clock thinks it's 3am, I usually pass on the breakfast anyway. The midnight departures are a choice of either supper or a full breakfast - one meal only, and there is only really one "traditional" main meal option in the menu, although you can book the cook if you want a choice of dinners (for supper). Many, including me, skip both meals in favour of sleep and these flights are much quieter due to the limited meal service, later departure, and absence of European originating passengers (which connect to the 9pm flights) - whose body clocks think it still the afternoon.
I really don't see a huge issue with a lighter breakfast on QF's SIN originating flights, although I can see that on the longer flights (eg ex-HKG) it is probably more important. Personally I think the name "cafe" breakfast is a bit of a @*&#*&. When I have breakfast in a cafe it is usually a substantial cooked breakfast, such as eggs benedict + sides, whilst at home I just have simple cereal/toast.
