I explain why I think Scala will be giant to people by saying it is Java's C++.
You know, back when Java was getting huge and I was still in grad school, Java was supposed to cure everything that was wrong with C++.
In the same grad school -- an old timer professor (so old, he actually wrote the very first commercial implementation of Merge Sort -- on paper punch tape, no less) looked at some C++ that used templates and commented, "C++ must be the new Cobol."
The C++ code I like is minimalist. The languages I like the best are minimalist. It's just my personal taste, but I don't see the point of making things more complicated than they have to be.