Haha that's a great thread in the link above. My favourite reply is
'will get even worse with end of baby bonus.. less bogans updating the VN for VT...'
I know of a few dealers that have disappeared in the 2 years we've been here but most remain.
The car trade is the same everywhere - if you have something desirable at the right price, it will sell. Otherwise you will need a good salesperson.
I don't think anyone can tell you the general state of the trade, in my experience even the dealers will exaggerate or play down how busy they are depending on who they are talking to.
Best of luck with your venture.