I would also argue that even if the abstraction overhead of CoffeeScript proves problematic in the long run, it would still be an excellent tool for writing out

I would also argue that even if the abstraction overhead of CoffeeScript proves problematic in the long run, it would still be an excellent tool for writing out a functioning sketch of your project. The individual components can then, if needed, be rewritten in JS. And because of CoffeeScript's golden rule, that's a wonderfully simple process.