That would leave Cronulla, Penrith, St George, Parramatta, Souths and Easts as the only options for relocation. I cannot see any of them leaving Sydney for Adelaide or Perth.
Easts are a perfect fit. They have no juniors and would get a whole state. They dont represent Sydney just a beach in Bondi
They bring profile and lots of used cars to sell
Their colours align with South Australia colours just add yellow
And they have been succesful recently with attracting 20k crowds in Adelaide and struggle for crowds away from the SCG member pool