This is an interesting case. A new programming language is a frail thing, and can only grow and prosper if it finds an unoccupied niche. Japan was the perfect environment for Ruby to develop until it was ready to take on the world.
It's as if mammals evolved on an island without any dinosaurs, and then swam over to the mainland.
Mouahaha you killed your argument with this example. Matz is not really a typical Japanese. He is a mormont, he's fluent in English, and lived extensively overseas. There's almost no Japanese like him. So let's forget about this case.
Well, one of Japan's coders. Matz was kind of revolutionary.
Ruby isn't exactly revolutionary. See: Smalltalk. RoR, however, was.