The house isn't the show though and we know it's contents have almost been entirely stripped out and sold on, so even if it were to return to Dreamworld they'd have little more advantage than any other studios offering it a home.The house will eventually be demolished for the project in the area, but I guess they have some arrangement with the developer to keep the compound intact for as long as possible. Does that mean it will ever be there again? Who knows? Depends on whether the two coincide.
A new network and a new location is probably just what the show really needs - the same show on Nine from Dreamworld doesn't really get my interest.
P.S. I guess with Ten now casting for next years Masterchef that Masterchef has now outlived the original run of Big Brother. Who'd have thought that was going to happen back in 2009?