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"Great web frameworks like Ruby on Rails, for example, can’t be built without relying on a more dynamic language."

You don't necessarily want dynamism, you want metaprogramming.

Interesting, could you provide some examples?

Actually it's not even really metaprogramming just like expressiveness. In Ruby's case it's metaprogramming though.

A lot of Rails/Ruby magic hides in the dynamic "generation" of code and in the nice DSL-s. However you can typically achieve the same using e.g. macros (which work on compile time) and which can be even statically typed.

The DSL thing is orthogonal: it's more related to the language syntax than to the type system.

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