I think people who say other languages "just don't get it right" are living in a fantasy world. At the end of the day, Smalltalk is a pretty extreme language. The insistence that, e.g., every integer value is an object that can be sent messages, or that every code block is an object, or that every code block can introspect its caller, all lead to a pretty extreme amount of flexibility but an inability to write efficient code or do much optimization.

At the end of the day, languages that were less extreme won the popularity contest. Ruby and Python, for example, are just more accessible and full-featured.