How can tie keep being denied an afl team?

tasmania has a population large enough to support 1 team especially if south australia can support 2 . tasmania defeated all south australia and western auttralia in ll grades in the 50,s and 60,s and still produces many talented players. if the government and the people are willing to back a team in tie why wont the afl. surely this is in the best interests of a game that claims to be national