[1] https://www.geekwire.com/2017/legendary-computer-scientist-j...
Since oracle changed the release schedule to be a thinly veiled "pay us money or upgrade your JDK every couple months" model, there is a lot of uncertainty in javaland.
If you think that corporations would just stay up to date... well, then you clearly don't know how slow corporations are to adopt new JDKs.
The problem with Android was that it was using, Harmony, a clean-room implementation of JDK whose license is incompatible with OpenJDK. It was believed at the time that APIs were not copyrightable, and thus that clean-room implementations were not derivative works. The courts disagreed. Now Google just uses OpenJDK for Android and they are back in the clear again.
But they didn't
They have golang and dart to stand behind, they have no "need" to push Java.