So, essentially it's just some type of indexed annuity. That's all well and good, IMO, as long as one considered:
- amount of fees involved (which eat into the ROI)
- how do you choose the private company to issue the annuity?
- what government backing exists in the event of the aforementioned company's liquidation?
Many states now have $100,000 protection against annuity company defaults, as an annuity is traditionally only backed by the strength of the issuing company. If the SS system is going to be replaced by various private insurance companies you would need/want some FDIC-type backing in place.