Announcing Deprecation of the Google Earth API
googlegeodevelopers.blogspot.com
googlegeodevelopers.blogspot.com
The in-house application I've worked on for the past few years started out using Google Earth, and I later added the ability to use the Cesium WebGL-based library. Wouldn't be surprised if this starts a mass migration over to Cesium.
I wonder if there will be a WebGL version someday. I think the requirement of a plugin kept the Google Earth API from being popular.