The problems with economic model or most modeling are not the methods. It's usually dealing with the quality of the features or parameters. Even in a much simpler problem, no matter how good the methods, if you don't have the right params, your model will suck. And with economic models, it's dealing with a open world system with ever changing params, the challenge is not on the methods, but how to discover quality parameters/features. And that require not just the skills of modelers but many other disciplines.