yeah I agree. I just think the screening system would be good. Even though it is a regional airport - Carnarvon could do with it - as well as other regional airports. When it comes to safety - any measures are good.
But like you said, in the end it will be the passenger who will pay for the cost - and how much extra it would be in an airfare is anyone's guess.
I dont know the dimensions of Carnarvon's terminal but it is fairly big - not bigger than Geraldton but its bigger than Kalbarri and Monkey Mia - those airports are like tin sheds.
Cheers,
Saintly.