If stable longevity for your project's implementation is important (as your question implies), then I think Scala does present additional risk (relative to stab

If stable longevity for your project's implementation is important (as your question implies), then I think Scala does present additional risk (relative to stable/mainstream languages). It sounds to me, too, that they are thinking of changing fundamentals in the language/system. This could lead to something like the Python2vs3 scenario for a while. If you base on current Scala, you might (likely) later find yourself doing either a re-write, or being relegated to a "compatibility" library. You're wise to ask.