I think it would behoove you to use Kotlin. When every other post on this board is about Kotlin, it is clear that is where the industry is headed. Use Kotlin, or risk being left behind.
Um, no. What happens on HN is nowhere near an industry driver. It's better than many forums, but it's not some powerhouse of technology industry influence, nor does a trending topic on HN necessarily indicate a particular trend in the industry in general.