@Evert Nice thinking Evert, but the problem with your idea is the reaction of our body to silicon.
It is indeed possible to perform the surgery, without complications and major scar tissue, however since the silicon pouch is foreign material in your body, eventually, your body will attack it and try to dispose of it. Breast implants have an average change rate of about 10 years (differs with kind of silicon, how well the surgery was performed, and individual variances (like if you have a hyperactive immunesystem, some implants need replacements after 5 years)). Same goes with artifical knees and joints, they sound fantastic, but if you are young and get one you are properly fucked. No one wants a surgery every 10 years.
So we first need some improvements in the way we can integrate foreign material in our body. If we have to replace our silicon bag every 10 years, with surgery, complications and what not, this would not be a viable solution.
