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> Without a motivating example, it's hard to imagine that people will want to pickup a Go-like (but not exactly Go) language for data science

Exactly. I use almost exclusively python (including for data science- or ML really). I've been wanting an excuse to learn Go by doing a project with it. But learning some third Go-like language would be a tougher sell for me, unless there is really something it does better than python, because it still doesnt give me the benefit of learning Go.

But like someone else said, "because you can" is usually a good enough reason to build or learn a new language, so I'm sure it's still worth it for many.