Well yes...it is absurd to expect 8% but many retirement systems still use unrealistic returns....makes absolutely no sense, but it does put a huge amount of pressure on the FED. Can't cover the obligation? No problem.....have a policy that "creates" inflation and devalues the currency...problem solved. That's what they teach these days at Princeton.
It wasn't long ago that conservatives argued that the return on SS funds was too low because they were invested in gov't bonds. The whole privatization chant as based on the high returns in the stock market. Now they sing a different song. Must be Ryan’s extensive business background.