Yes a shortage of supply will put upward pressure on prices.
But there could also be a fall in demand which will offset it.
Fall in demand could be due to punters being hesitant to punt again or punting less due to fear or recession.
Also a lot of customers at Asian shops are temporary visitors to Australia and these men are not arriving anymore.
Also, initially shops will probably offer discounts to try and get customers back into the habit of punting again, so initially at least prices could come down.