Lockhart was a different story.
In controlled airspace Class D, you've got CTA steps along with minimum descent altitudes and usually a controller monitoring what's going on. Relatively low risk.
WRT to Lockhart, I think that TAWS (forward looking) GPWS was introduced after the accident so we have a little more protection than we used to.
Operations at non controlled aerodromes, mix of traffic etc needs more attention in my opinion. Separating RPT from the little guy is what needs to be focussed on.