Yep. That's been the policy of VFL/AFL since the 1980s - get teams in the big cities, regardless of whether it's heartland AFL or not.
A marked contrast to NSWRL/ARL between 1982 and 1995 where places like Canberra, Woolongong, Newcastle & Townsville - mid-size markets in heartland territory - were priorities.
Admittedly those markets are bigger than the AFL heartland markets outside capitals (eg Bendigo, Ballarat, even Hobart).. but still can't overlook that AFL made all the biggest cities a priority - and it's reaped rewards for them.
I'm not begrudging Newcastle, Townsville & Canberra their NRL teams, but it adds pressure on Sydney, because if we want geographical coverage of AFL with a competition of 16-18 clubs that doesn't stretch coaching/player depth, rationalizing Sydney comes into sharp focus.