I know many people think I am going to be crazy, however I am starting to think whether WSI will be popular with residents from the Hills, Hornsby Shire and also Central Coast as a replacement airport than SYD.
Going from Central Coast to SYD requires using the M2 and Sydney Harbour Bridge, which gets very crowded during morning and evening peak, whereas M7 would have lighter traffic, which means those from these areas to WSI could end up a faster ride than travelling to SYD.
In particular there is going to be absolutely no traffic lights between Pacific Motorway and WSI, whereas even using M2 to SYD, you still have coughberland Highway Traffic Light to stop in midday if not the series of lights from Chatswood to Hornsby.
Perhaps bus companies should consider having a bus service from Hornsby, Gosford, The Entranace and Newcastle Interchange to WSI.