There'll be a gap in the market for VA if/when Alliance stop flying to Emerald, Moranbah, Gladstone, Rocky, Newcastle, Mt Isa on their behalf. Most of those ports can't take/won't sustain a 737-sized aircraft and Saab/J32 won't cut it either.
There could be an opportunity for Cobham to get into the East Coast with their Q400's if they can ramp up quick enough. They have a few more Q400's due before the end of the year as it is.