State of Kotlin 2018
pusher.com
pusher.com
Ouch. The article seems to emphasize that younger programmers are adopting Kotlin more than older programmers, but makes no attempt at explaining why. Of course most people who have been programming for quite a while probably went through the phase of trying to learn everything new that came out. Then they realized how much time they wasted as many of those things became obsolete.
IMHO, all it's going to take is some agreement between Oracle and Google for Google to loose all interest in Kotlin. And I'd put it at a very high probability that Google being required to loose interest in Kotlin would be part of that agreement.