They already have when they did away with the use of bucket...

They already have when they did away with the use of bucket companies which resulted in paying tens of thousands more in tax.
And when that results in having to then pay 30% tax on the concessional contribution into super you are left with no choice but to look to create other alternatives to reduce tax.
With regards to super, now we wait to hear if they will in fact introduce the taxing of paper profits.