I did the tree change from Sydney to Mudgee about 11 years ago.
The good:
No traffic lights.
Never have to park more than 50metres from your destination
Can leave for appointments 10 minutes before their start time and still be early.
People are really friendlier, if you say hello in the street you always get an answer (I know because my Autistic daughter says hello to *everybody* that walks past)
The air is *so* much better, the nights are so much quieter, and the skies that much darker.
Sense of community, I entered some roses in the Mudgee show this year, and the other growers all nearly talked my ears off, offered me plants and advice and I had never met any of them before, but made some instant new friends
Good food, great farmer's markets and fantastic wine, there are enough Sydney and Newcastle ex-pats running cafes and restaurants to keep the standards up!
The Bad:
It took me about a year to get work, once I did get it, there was no shortage, it just takes a while to get 'known'
People don't visit from the big smoke as often as they think they will.
(I built a really nice cabin for visitors, but it was rarely occupied)
Anything you buy on IceInSpace classified has to be shipped
The lifestyle really is fantastic, I notice it most now when I have to go up to Sydney, I used to miss it, but now I can't wait to get back from the traffic, noise, pollution and advertising/marketing madness.
There are actually plenty of services here, and you make friends easily, people are surprisingly supportive. The first six months can be a little bit lonely until you get settled, but drag your friends out to visit, and don't take no for an answer!
Personally, I think if you worry too much about disasters that might happen, you end up slowly shutting down and closing off from the world. My mother works in aged care and sees it all the time. Be prepared but not scared...
There is always the opportunity for one more adventure, I'd say give it a burl, if you don't like it after 2 years, then call it an extended holiday and move back to the city again.