For many use cases OO Scala works just fine, functional code used where it makes sense. Our goal is to integrate with existing systems, not to seek purely functional code as a goal in and of itself.
I agree with the concept. My concern is what happens as your team grows to include others whose Scala background is more functional. There is a sense that they should be aware of the old way your code base is put together. Unfortunately things could go awry when they code new functional based code expecting functional based input.
Don't get me wrong, I like Scala. You just really have to watch its dual paradigm behavior when dealing with Java code
