What would happened if the proposal of Waverley park upgraded to 156k?

In the 70s the AFL wanted to make Waverley Park the Main home ground of the AFL so they proposed to upgrade Waverley Park to 156k seats, but ultimately it would be a threat to the MCG so they scrapped the idea, But I am wondering what if they went through with the plan and upgraded the stadium, who would play there, and would it host the grand final?