ABC news has a video of the scene (scroll down to "latest video and audio") .. I guess they just never made it to that "one long runway".
Practically no powerlines or poles out there to hit .. but roadside signs pose a hazard, as at least one RFDS pilot found to his great concern - when he tried a shortcut by using the Eyre Hwy (quite a number of years ago), instead of the runway ..
I seem to recall he shortened a wingtip on a road sign .. and got grounded for 6 months for his less-than-attentive piloting skills ..
Had a friend/work colleague who landed his Cherokee on the Coolgardie-Kalgoorlie Rd quite a number of years ago, when a tank crossover valve failed .. and he was going quite well until a wing hooked a big road sign .. and it took the wing off ..
I can see at least two large road signs in that ABC news vid, and I would rate them as a possible likely factor in the crash.
http://www.abc.net.au/news/