If there was a single football code with a league of 20-24 teams as people are suggesting here, I honestly think there would be a marginal case for two Tasmanian teams.
If you just looked at the population, it wouldn't make sense - but if you take into account how parochial northern and southern Tasmanians are, it would be one of the most intense "local" rivalries in the country!
Not sure...we already have local leagues playing intra state games, and they get marginal interest...it's been a long time since they were the real deal...we just keep breaking the mould, because yes, you'd think it would be a big game, like a derby or a showdown...but...