So the Right Thing is a language that allows to extend by itself, and makes such extensions run blazingly fast as well. It's been done in some languages (like

So the Right Thing is a language that allows to extend by itself, and makes such extensions run blazingly fast as well. It's been done in some languages (like the one with lots of ()'s) and I don't think there's an inherent obstacle for Ruby to do so, though it would take time. I don't think they should sacrifice speed for extensibility now, but it'd be nice to aim at both as long-term goals.