I agree with Daniel that location is a major issue. With two population centres in Tasmania, the team would probably be obliged to divide its time between Launceston and Hobart, and I struggle to envisage a strong team being developed that way.
It's tough to argue about the Gold Coast as a viable location. West Sydney could work - it does have a successful presence in several national competitions which Sydney is already in (Razorbacks vs Kings in NBL, Rams vs Fleet in defunct ARL, Ice Dogs vs Bears in AIHL (although Bears have ironically gone further west to Penrith now), and I heard they're looking at an A-League team there also). Of course, I'm guessing they'd play at Homebush as well.
The question, however, is where else would you put the new team? NT and ACT do not have the money to be viable. Tassie has the above issues. WSyd is likely to have better viability than Newcastle/CCoast.