Why harp on the AFL as a reason for reconfiguring Sydney or Brisbane though?
Like it or not, the AFL is relatively unimportant in those two cities - normal AFL matches are regularly beaten by the news or talent/dating/cooking shows, while the AFL GF rates ~ 1/2 what the NRL GF or State of Origin matches do.
The do not compare channels 73 and 70 in Perth or any other combination of simulcast. The ratings for secondary channels such as 7mate are low. The ratings for 7 Perth lead all other Perth stations. 7Mate ratings after the grand final are higher in Adelaide which is SD than they are in Perth with HD and SD.