Australia is too closely ranked to other countries with successful startup ecosystems in the major market and freedom indicies. The USA is now going through the long-term capital gains issue, and nobody has suggested that less startups would be founded, or that there would be less innovation because of it. As Warren Buffet says, he has never known an investor to turn down an investment opportunity because taxes are too high.
In fact, there is no capital gains tax. It's all taxed as income. There is no incentive to sweat it out for years building equity because once you exit, you will give an enormous chunk to the government because you are suddenly in a $1M+ tax bracket for that year only.
Their bankruptcy laws also don't reward risk taking as well as the US either.