How much longer will the low interest rates last?

Everybody knows that interest rates are historically low. How much longer they will last is up for debate...

http://www.boston.com/real-estate/news/2015/04/13/how-long-will-low-interest-rates-continue-help-buyers/tTW28ti4R7l4M91imFYyRL/story.html#sthash.9hy7dZ2O.dpbs