I think you are missing the point Traffic
Firstly Toowoomba is a city of over 130,000 people and the second largest inland city in Australia, that has outgrown its tiny airport (which is now surrounded by houses).
A decent airport will attract increased services to Sydney and eventually elsewhere.
In the longer term, like 25+ years, which is where the Wagners are looking there is a real possibility of freighters from Asia.
The planned new airport just happens to be adjacent to the proposed Toowoomba bypass, and once it and the alternate range crossing are built Wellcamp will be closer to Brisbane's western suburbs than the Gold Coast and similar in transit times than Brisbane Airport.
Wellcamp over time could also be a viable alternate for Ipswich.
Keep in mind a lot of agricultural produce is grown (or can be grown) in the area for high value export, including quite a deal for air freight, so as Brisbane continues to grow, particularly in the western and south western areas, Wellcamp will definitely be a viable alternative, particularly if there are cost advantages for distribution and warehousing due lower costs than in Brisbane, plus the prospects for agricultural/horticultural airfreight backloads.
Likewise in the 25 year timeframe the Melbourne - Brisbane inland rail line could well be a reality.
http://www.nationbuildingprogram.gov...nd_Railway.pdf This project is far more than a pie in the sky idea. Take a look at the map in the link, it runs right past Wellcamp.
The Wagners are not looking 5 or even 10 years out. These guys are looking past their next generation. Very smart guys!