The "rules and regulations" that are proposed in the article are simply to reinstate the principle that bankers should not be traders. What's happening is that Goldman Sachs has physical assets in the aluminum market, and also the ability to speculate on that market. From the article: "By controlling warehouses, pipelines and ports, banks gain valuable market intelligence, investment analysts say. That, in turn, can give them an edge when trading commodities. In the stock market, such an arrangement might be seen as a conflict of interest — or even insider trading. But in the commodities market, it is perfectly legal."
How are the "little guys" hurt by preventing insider trading? Do you plan on founding a startup that speculates on commodities and also controls those commodities? Do you think that such a startup should exist or would be capable of bootstrapping without hundreds of billions in initial capital? Startups are only able to exist in the cracks created when we take the hammer to the monopolies.