Kevin Drum says that Bob Balls endorses Robert Waldmann's proposals for Social Security.

I forgot to mention this yesterday, but the Century Foundation has published a paper by über-mega-lifetime Social Security guru Bob Ball that outlines a "relatively painless solution" for restoring Social Security to solvency. Basically, it raises the payroll cap a bit, dedicates estate tax revenue to Social Security, and invests a portion of the trust fund in the stock market.

I argued for Balls' point one here here here here , here here, here, here, here.
I argued for Balls's point two here.
I argued for Ball0s point three here, here, here, and here.