Yes, definitely need Tasmania in the AFL, and the NT.
Tassie has issues in the fact of a low population, and Launceston and Hobart don't really get along!
(Or should the Melbourne Demons become the Tassie Devils!?

)
With 2 new teams, there would be 20 teams in the comp.
Then you could run 19 rounds plus an extra Round for Local Derbies and BlockBusters. 20 Round Season.
Finals for Top 10.
5 Week Finals series.
Week 1 is 7 plays 10, and 8 plays 9. Winners advance, for official 7th & 8th spot.
Then normal 4 Weeks finals for Top 8.
But doing a Top 10, it keeps 11th, 12th, 13th, and even 14th involved in the season for longer. 12th spot might even still have a wiff of finals action in the last round.
This format would be 20 rounds and 5 weeks of finals. Current is 23 weekends plus 4 = 27. My new system would be 20 rounds + 1 bye (staggered), + 1 State of Origin Weekend + 5 weeks of finals = 27. It would also be a fair Draw, except for the Derby Double Up... But I think you need to play those BlockBusters twice. Also, they are cheaper to run... All teams stay at Home, except 1... Send Tassie to NT, or Vice Versa.