you won't get paid a pension under 67 so if you can support yourself before that age, sure you can retire before 67.
It's interesting that Australia mandates this. Here in Canada, you can get your government pension as early as 60, and as late as 70. Obviously the longer you work, the bigger your cheque will be.
That said, I still feel that there will be 'problems' the taxpayer will have to handle moreso in the future: Canada Pension and OAS still pays very little when compared to modern costs of living... This will become especially problematic for those that rent, and don't own their home.
The Canada pension scheme was introduced in the mid 1960's, when employer unionization was strong. Basically Canada Pension was a means to supplement your union pension. But now that unionization is at an all time low, many people don't have workplace pensions anymore. It's a problem that's slowly being addresses by jacking up mandatory Canada Pension contributions, but I'm not sure it's enough.