Why do you think Everest has remained untrodden in 2015 Is is a comercial expeditions' fail Were they the last earthquakes Was it the Tibet closure 1974 was the last year that Everest was unclimbed.
Even K2, Kangchenjunga, Lhotse, Makalu, Cho Oyu and Dhaulagiri have been unclimbed in 2015. Let see what happen in late October, November and December...