In the context of this accident, the whole RAA flight training issue is a bit of a sideshow. I don't deny it needed examining, but it doesn't seem to have been a primary factor.
What would stop a well trained PPL or even CPL in a 172 having the same accident?
Would they not operate at a 540m airstrip, or would they never need to go around, or would they just not hit an unseen obstacle in the splay?
You can't tell me GA pilots never hit obstacles in the approach/departure areas of airfields.
The more relevant issue is the control of obstacles that might be erected around airfields by people who are not necessarily familiar with aviation.
There is a swap meet every year in Ballarat that operates in the old closed section of runway 36. What stops the organisers from deciding one year that a ferris wheel would be a good idea, erecting it one afternoon, and catching some student doing night flying that evening? Or just moving the raised toilet block to the fence closest to the runway and mounting some loudspeakers on top?
Non-pilots are not a good judge of these things. They look at the height, look at the runway and see that there's hundreds of metres available and think that's plenty of room (based on actual conversations).