If you mean the "getting worse" part, I believe the implication is that Google's lack of control over either Java the language, or the Android device ecosystem

If you mean the "getting worse" part, I believe the implication is that Google's lack of control over either Java the language, or the Android device ecosystem upgrades, means the future would likely see increasing fragmentation/divergence in important core language features across Android devices, causing much developer pain. If one assumes e.g. in comparison Apple will in 2 years have 95% of devices capable of running Swift 3 apps vs. 15% of Android devices capable of Java 8, much less 9/10 ... it could be quite a competitive disadvantage for Android, as well as argument for adopting a forward-looking JVM language dedicated to compiling to 1.6 bytecode if you plan to do Android development.