Language design is vital for a language that can evolve. If you build a language for "cowboys" with the immediately-useful functionality that you can see, but without the "language geeks" insisting on the underlying principles, you end up with a language like perl - one that can dominate a particular use case for a while, but will be virtually impossible to evolve, and ultimately fall out of favour as it's overtaken by languages with firmer foundations.

That's why I'm betting on the strongly-typed functional tradition - OCaml/Haskell/etc. These language already have the killer feature from this article: they can be (almost) as expressive as Python and (almost) as performant as (naive) C++. But they also have really solid design with a lot of thought put into it that will let them evolve to meet the needs of the future.