I reckon this comment from 6 years ago predicts Kotlin's fate https://news.ycombinator.com/item?id=24197817 I consider it prophetic.

My gut says Kotlin is great for individual developer experience. But I never heard or saw credible reports on the Total Cost of Ownership, e.g., Kotlin engineers hiring, swapping out on a team.

It's a blessing when you're in the native Android / React Native / Flutter space.