Soup Nazi
You're forgetting the "Eastern" side of the equation.
My calcs have Eastern losing three x Q400 positions. For an affected Perth pilot to relocate to Adelaide will mean moving to the bottom of the Sunstate seniority list.
I'd be thinking that most likely the Q300 Captaincies will be filled from the current Sunstate list and that only the FO positions will be available to any Perth transfers. Suddenly not that attractive, IMHO.
About the only plus is that realestate prices in Adelaide are lower than Perth.
Look at the track record for new crew bases:
Adelaide (MK I): A few months
Canberra: Three years (maybe four?)
Perth: Three years
Not great, esp. when you're thinking of moving a family with you.
DIVOSH!