You can talk about replacing players all you like but Australia's biggest problem is their players are simply not good enough and they simply aren't producing players who are good enough.
They are picking the wrong players in a nutshell. Basically there are a myriad of problems and frankly i'm sick and tired of seeing them and wasting my keystrokes trying to discuss them.
From Contract regulations and attitudes, to horses for courses and money. They are selecting more on form/stats rather than identifying that certain players present potential and harvesting them for the long term and moulding into proper test cricketers. In a babushka style second smaller nutshell the players they are picking/favoring are less and less natural cricketers and hard grafters which start off their career on the right peg, and using a 'pick the big muscle dummy athletes and try and make them cricketers. They need to be able to bowl fast, hit sixes and fours and field well' type of weird strategy.
Like I said there is a sea of problems but I reckon there is just way to much red tape there to actually knock it down and rebuild it from the ground up. They are trying though.
edit; Oh and like this Pattinson injury, they no longer risk young players at all and help them 'manage' through their injuries. They just up stumps instantly at the slightest risk of an injury. But to me they do too much weight and impact work and not enough aerobic.
Their FC system hasn't produced a top quality batsman since Michaels Hussey and Clarke, and as the old guard have retired one after one the effect is there for all to see.
In terms of FC potential; Hartley or Paine should be in there keeping for a start, the Matt Wade experiment absolutely fecking infuriated me beacuse he's always been shit with the gloves and mediocre with the bat. Lord knows how he got picked.. Haddin is experienced but not a good enough gloveman to justify that selection and his batting is very up and down in general. He's a natural hitter suited to short form.
Shaun Marsh and Bailey have always been suited to test cricket. Marsh had a few injuries and a few up and down starts to his test career. Bailey feck knows why is playing T20 and ODI he's absolutely fecking shit house at clubbing the ball. He should definitely at least be there at the moment on call. Jordan Silk is another young lad that should be groomed by CA to play test cricket. Scored a 370 ball hundred in the Shield final. Ferguson got injured at a bad time and Nic Maddinson despite presenting form is a red tape issue since he isn't contracted to CA.
There are players there but they are being told to play as much short form cricket as they can to get a shot at test then being dropped prematurely when they don't perform and adjust quick enough.
Ugh. Like I said there are plenty of red tape issues that are fecking it over at the moment. My suggestion still is (as it was a while back) cut all their endorsements and contracts down to 60k/yr solid wage and give them win bonuses of something silly like 30k, 40k per win.
I bet they fecking start winning games quick smart.