The problem with what you propose is that people can live frugally and tend to do moreso as they age. This would mean less outbound tax over time, a greater super balance to be inherited and the problem recurs.
A better way would be to scrap the stage 3 tax cuts, increase the contributions cap to allow that and more money to be put into super to take the need for aged welfare and aged care prop up away, get rid of negative gearing for more than one property, make the holding time for CGT discount progressively increase to 5 years, get rid of the trust scam, have 5 year parliamentary terms to allow the incumbent govt's plans to be seen through so that meaningful reform can be implemented, run govt departments efficiently, don't sell off national assets and renationalise essential services, etc etc etc.
