I think rates in the USA will be be flat to declining for a long time. Short term rates are negative in most of the developed world, and long term rates are now negative in Switzerland and getting close to negative in most of northern europe.
The 2.8% you get from the US 30 year is just about the highest in the developed world.
Switzerland is just nuts though. Deflation of more than 1% in 2015, and the central bank saying deflation will continue for at least another two years. Bank deposits denominated in Swiss Franc pay -1.25%.
