Umm...
About 1400 are dead, I have yet to see any reports exceeding that. As for deaths on Mount Everest, about 18 are confirmed to be dead. Those numbers are way off from the 3000+ you stated.
Mount Everest only had avalanches due to the Earthquakes from a distance. Nothing else happened to Mount Everest, it's height remains the same and still growing with each passing year. The only height change might be because snow slid off the top of it.
Tragedy such ancient temples were destroyed from the earthquake... Even more so on the lives lost. I wish the best for Nepal currently.