I apologize in advance for not recognizing them, but I'm not certain that those reasons you allude to are so obvious. After all, DFW-Australia would open up single-connection service to many, many spokes that are currently double-connections via LAX. Spokes like IND, CMH, ATL, TPA, PHL, PIT, MCI and countless other smaller cities that enjoy nonstops to DFW but not to LAX. In all, those cities represent tens of millions of people who have nostop service to DFW but not LAX.

Granted, the double connection is probably not a show-stopper, so single-connection service probably won't open the floodgates and result in hundreds of new daily Australia-bound Yank tourists. Not all Australian tourists limit themselves to destinations that are nonstop single-connections from LAX, either. The show-stopper for many Americans to visiting Australia is probably the airfare (it ain't cheap) and the travel time. And DFW-Australia nonstops probably won't significantly alter either.