Air Nelson is making money with the 340a and I am sure SAAB will be doing all that they can to make sure they stay in SAAB's .
My 5 cents is that they will upgrade to the 340B as I'm sure as you say barbers the bean counters will be looking at the cost of 340b vs anything else would be stacked easily in the favour of the 340b's a few spare sitting around in the states, would be easy to get a fleet of 15 nearly identical.
Saw a dash floating around there the other day, nice plane but I hear it burns a heap of gas, definitely don't think that will be happening.