Monopolies can go bankrupt too. Karma is catching them now.
Maybe ripping off tourists for a train ticket will save them?
https://www.tripadvisor.com.au/ShowTopic-g255055-i120-k11104986-Ripoff_Train_Fares_At_Sydney_Airport-Australia.html
Or the extra airport fees for rental car companies and cabs
disallowed/business/consumer-affairs/terminal-illness-nope-review-finds-airports-aren-t-gouging-anyone-20190205-p50vss.html
Or maybe that 100mil / year from overpriced parking will save them? How about additional 100$ fee for picking up a family member?
disallowed/national/nsw/profits-keep-going-up-up-and-up-accc-takes-aim-at-airports-monopoly-20190225-p51008.html