I was really into Scala and studying it and everything. I still remember all the scala bloggers I follow, Daniel, Tim MOrris, Paul Snively, etc...
Eventually I landed into a scala job role. Oh boy was it different. The other programmers were like type casting to Any or whatever that generalize highest type was (unified type theory).
The complexity is pretty high, it's great if you know it all but in all seriousness it was impeding...
Personally, I like the object + static typing + first class functions as it eliminates 90% of errors at compile time. If any error occurs at run time, am pretty sure it's logical. This is a huge plus. The only drawback - the ridiculous amount of type specific code you have to write for mundane changes/updates.
As a Scala dev, that is absolutely terrifying. I can't even begin to think of a good reason for that.
(Ok, but in all seriousness... don't.)
The Java community has its flaws (oh boy, does it) but it has adapted to the hordes of mediocrities. Give Scala to mediocre engineers (who typecast to Any, use null instead of Option[T]) and you have the Java hell with worse IDE support and 5x compile times.