I meant adoption, but mentioned that some of the issues that make it less well liked are being addressed.
I think it possible (though far from inevitable) that another JVM language will achieve dominance on the JVM, and it is very possible that Java will fall below the 60% or even 50% on the JVM (with the rest being taken by several, though not one dominant, languages). But this is still some years in the future.
That seems to be a pretty popular opinion among the Java pros that I know. Some of the early Scala adopters seemed to believe that, and many are likely still of that opinion. It may take years for an alternative JVM language to be dominant in terms of overall code, but might not be quite as far off when using a metric such as 'new projects'.
I think it possible (though far from inevitable) that another JVM language will achieve dominance on the JVM, and it is very possible that Java will fall below the 60% or even 50% on the JVM (with the rest being taken by several, though not one dominant, languages). But this is still some years in the future.