I have used many of the fancy staticly typed languages and still find dynamic languages more productive, and more accessible to a larger range of people.
It's about at that point, particularly if there's multiple files, that I find myself suddenly wishing for stronger type systems.
That being said, most things I write (outside of work) aren't that long, and you can get started faster in dynamic languages.
More importantly, there is no conclusive empirical evidence either way.
Also, in the open source world there is no visible difference in robustness or productivity.
Edit: I forgot to mention go, and I thought HN was better than down voting someone that has a different opinion.
Of course, there are folks who will feel that even though there are less comments lately the level of discourse is higher.