I didn't mean to say that core language isn't important. It is important. My main point point is that the community should be able to partecipate in the design. This is why I've advocated a fork of Arc, because to improve the core of the language you need help from who will use the language. A prototype is a good way to make this happen even when you're in the design phase and not in the production phase, but it is useless without a communication channel between the designer and the users.