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They aren't the focus catchment for this airport.doubt if there's many regular travel demands are present at WSI concerning most people who can afford time and money wise to travel are actually in Eastern Suburbs, Sutherland Shire, North Shore, Northern and Northern Beaches.
Id suspect there's multi things at play. For those that haven't broken into the SYD market, there's no rush or need to be with the launch. They're probably eyeing the situation if they did want the Sydney market, but seeing how it functions would be prudent.
Other airlines that "fit" WSI currently don't have the aircraft or capacity to expand.
I still believe its biggest immediate use would be air cargo. Over time as we see more expansion in the Indian space we'll probably see more from there fly to WSI. Maybe other like ZG when they get their refurb 787-9 from JAL might start something up (they've got to be eyeing JQs loads to Japan and want to provide a better option).
The majors probably won't run more than a couple of flights that are designed more as overnight connection flights. As for the other Value/LCC that currently operates SYD, there may still be room for moving if the price is right and demand increases.