I think it could be possible to have a ATC, but for it to profit it'd have to offer something that could appeal to fans at a very basic level and would have to have the approval of Hasbro.
What if instead of having a boring ol' convention, we had an Annual Outback Transformer Destruction Day, where hundreds of fans dress up as their favorite TF and engage in battle in a massive field. Kind of like Larping, but with BOTS AND CONS!!
Then again I'd probably get arrested for trying rip off so many people's faces and shouting 'GIVE ME YOUR FACE!!!'
Instead of an entire convention, how about having a OTCA booth at both of the Oz Comic Con events?
I can tell you as a convention goer that is tight with some people. There has been a rumor merking around that there may be a tf con in 2013, this is just rumor though. But one of the biggest problems is that tf actors are mainly voice actors and there is no money to be made there in signature, and most people dont go for pictures either.
One guy on the Armageddon and Oz Comic Con has been plugging the contacts for some Beast Wars and G1 voice actors. So far from what I have been paying attention to is that he helped them get Garry Chalk down here for the heroes and villians convention this year. He has been doing a lot of work for Gregg Berger as well plugging his name out there and the details plus trying to get his son's band down here.
If you guys were to get a transformers convention up and running again maybe he is some one worth looking into.
Gok posted some pictures already and the last time anything was tried was 2009. Surely it wouldn't hurt to try again. I've already purchased a ticket to the Adelaide con so I'd be happy to help organize a booth.