User blog comment:Gandalf1801/Question/@comment-71.57.87.102-20150414183913/@comment-26973802-20150708060356

I imagine the orcs that escaped (which may or may not include Shagrat) would die slowly since the power that created them is destroyed. Not sure about the trolls. And I do not think there would be a new Dark Lord, the One Ring could have created a new one but it was destroyed with Sauron, and Wormtongue killed Saruman.