Scala is not in decline - as far as I can see it&#x27;s on the up and up. Scala has its share of warts but that comes with maturity - I would lay money that Kotlin won&#x27;t look so nice when it&#x27;s gone through a similar amount of change.<p>Ceylon OTOH is at least good design, though I don&#x27;t think that outweighs the library and tool ecosystem that Scala has.