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Nowadays, Java++ is probably the next Java. But also Kotlin. Kotlin has nice integrations in Spring Boot, Quarkus, or basically all the important frameworks. Go to start.spring.io, notice that Scala isn't an option there, it never was, but Kotlin is. And it is Kotlin that's now the default “DSL” in Gradle, replacing Groovy.
In general though, akka/pekko-streams are known to be one of the fastest implementations out there. Their grpc client for example even beats languages like Rust (see https://www.lightbend.com/blog/akka-grpc-update-delivers-1200-percent-performance-improvement and https://github.com/LesnyRumcajs/grpc_bench/wiki/2022-03-15-bench-results).
Another potential example would be a better C#, but unfortunately I'm not familiar enough with it to evaluate what can be improved. While I don't think Scala as any chance of replacing C# in Unity, in the indie space Unity has been losing some market share to Godot, which has bindings for multiple languages. A "better C#" could become the next indie gamedev language. Who knows, maybe this could be a interesting use case for Scala (or even Scala Native).