This has been expected, given that Google earlier announced that Chrome was dropping support for the Google Earth plugin due to security concerns with NPAPI, one of the technologies that the plugin is based on.
The plugin will continue to work in browsers that support it until December 12th, 2015.
Because of its usefulness, we hope that Google will release an alternative to the Google Earth plugin. Many plugin users have already started to migrate away from it to other technologies, such as the Google Maps API, or Cesium, but there is nothing yet that really replicates the best features of the Google Earth plugin.
Google does hint, at the end of their announcement, that there may be good news ahead :
Google Earth has a proud legacy, which continues with the new Google Earth for Android, powered by a brand new renderer. 3D is in our blood, and while we can’t announce anything just now, we look forward to sharing more exciting product news in the future.