In my opinion, this idea, good or not, will never ever ever happen. Why? Because the major political parties are owned by the banks and they (the banks) will see Australia fall into the ocean before they agree to allow such a thing to happen.
Imagine how much money they'd lose if this were to become an option for the punters!
I don't disagree with the first paragraph, but the answer to the second is that in the grand scheme of things they're not going to loose that much. People in the target age group have negligible super by comparison the the rest of the pool.