Not really. They want to maximise the chances of the Tassie team being a success, both on field and off.The AFL doesn't need a slightly larger roofed stadium in Hobart for Tasmania to be a success. It's a deliberate hurdle.
One of those things is selling out the stadium every week.
It's colder and just as wet in Hobart as it is in Melbourne, so they don't want a half full Bell with player slipping around in the mud.
A roofed stadium will sell out every week, will attract visitors from interstate, and look really good on TV.
On top of that, it will be able to put on all weather events and concerts that wouldn't be available without the roof.