Hobart actually has more people closer to the ground that can access the ground than Launceston and don't forget all the people from Melbourne that will attend games.
Sorry, that's what I meant. I was only talking about Hobart.
Hobart has about 250k that are able to easily walk/drive/take public transport to a game, Canberra has 500k.
Hobart has more AFL fans per capita, but Hobart and Canberra have a similar number total.
Based on that, both cities have a similar number of AFL fans able to get to a game. Combined with the other factors I mentioned like higher disposable income and large neutral population, Canberra should be able to match Hobart for crowds.
I'd say the traveller factor should be pretty similar. Canberra's pretty much the same flight time away as Hobart, but also accessible by road. Plus a good option for any AFL fans in Sydney who don't get to see their team play in Sydney (similar to how I've travelled to Sydney a few times to see Port play).
Tassie's biggest advantage will be their state-wide support. Hobart may have a fanbase the same size as Canberra's, but the net will be double, with members across the state.