[Alupis]

> to say nothing of the labor pool for kotlin vs java

This is the biggest issue, in my opinion. Although, if you have a java developer that really likes the higher order features that are being added, Kotlin might be a very easy switch (after some basic syntax learning).

The nice part is everything you already know about JVM performance still applies within Kotlin. So you're not starting over from square-one like you might assume.