IN MY OPINION
The issue stems from the 24 hour news cycle and social media.
No longer can a politician have a long term view on anything, let alone anything meaningful. Everything is geared for the 7 second grab on the news, and opinions change as the social media frenzy spins up. It is arguable that Keating and Howard were the last PM's that had any real vision past the next election (or party room spill).
There appears to be such partisanship now that no matter what the current government puts in place, the future ones will try to rip out just because they didn't do it themselves. Doesn't matter the merits of it. NBN is the perfect example of watering down an excellent initiative. When they ran telephone cables all over the country decades ago, everyone thought that would be a waste of money, now a majority of the NBN will be a bottleneck in the not to distant future and will have to be redone.
This affects all politicians equally, no matter of what party (or independent) they belong to. My main issue is that I cannot see it getting any better in the future, and I certainly have no ideas on a solution.