JVM scripting is typically used for different purposes than the MRI so I think the fate of the two is probably independent.
Re: #2, Closure and Scala are popular but are rather esoteric languages. Kotlin is the new kid on the block that is picking up steam quickly. In large organizations, it seems like Ruby familiarity alone would give JRuby an edge. On the other hand, developers love shiny new objects (languages/tools).
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JVM scripting is typically used for different purposes than the MRI so I think the fate of the two is probably independent.
Re: #2, Closure and Scala are popular but are rather esoteric languages. Kotlin is the new kid on the block that is picking up steam quickly. In large organizations, it seems like Ruby familiarity alone would give JRuby an edge. On the other hand, developers love shiny new objects (languages/tools).