From the comments

by Tyler Cowen August 20, 2011 at 5:38 pm

It seems like market forecasts of low real yields 30 years into the future support TGS. How long does it take for long-run money neutrality to win out? If the yield curve showed low yields 100 years out, would that dissuade those looking for a monetary solution?

That is from fmb. Here are the real yield rates.