Somewhat related and sorry to break what may be some bad news...
Maybe someone can dig deeper into this, these websites state the Google Earth API (applications programming interface) will be discontinued and thus it will be a product based on Android. Programs like Windows executables use the API to access the Google Earth functions and images, if you stop creating the API (or if Google Servers stop responding to API calls from your Desktop version of Google Earth), so goes your desktop program.
iOS or Android News: Google announced the discontinuation of the service Google Earth API
Google Earth API Will Be Retired On December 12, 2015 - Slashdot
I imagine Google Chrome will have an Android emulation layer (if it doesn't already) so it can be run on a desktop, hopefully not too much gets lost in translation. A review of Google Earth Android:
Review of Google Earth for Android Version 8 - Google Earth Blog
These links don't state anything specific about Google Earth Pro or its future, maybe enjoy it while you still can.
Unrelated, but perhaps a sign of the times, Microsoft similarly has discontinued MapPoint, offering their users, instead, to use Bing maps.
Microsoft MapPoint - Home