The state will end up with a new rail line.
Paid for by the tax-payer, that no-one else wants and has no other uses besides running between coal mines and the Adani-owned Abbot Point port that is underutilised, heavily indebted and needing refinancing, and which is only likely to be refinanced if the rail line is built. The rail line's other purpose - possibly its main purpose - is to prop up another of the Adani group's underperforming assets (the port) that were bought with debt and need significant financing to remain viable.
The fact that the local government in Townsville and Rockhampton have been hoodwinked into throwing another $30 million dollars of their ratepayers money away for an airport adds insult to injury, but it's pretty clear you don't find the great minds of the 21st Century working in local government in Far North Queensland. At least the funding to build the airport will create some (mainly temporary) jobs, although the people who talk about these jobs seem to neglect the fact that the funding to build the airport was raised by making local government employees redundant, so the whole thing is a bit circular, except for the part where taxpayer dollars go towards building infrastructure to primarily benefit private companies.
If you want to spend a billion dollars on pork-barreling, spend it on fireworks and fighter jets and let the taxpayers get a show for their money.