This game is Freelancer, not Corplancer. Start restricting independent traders and you will see less traders. There is a reason many people don't join trading corporations; it's more appealing to be your own boss than a cog in a corporate wheel.
My opinion is outright no.
Another thing: why would a corporation (besides Ageira, but that's something from vanilla and therefore shouldn't be altered) really care if USI or some independent trader buys their product? They still get the profits. And last time I checked, the corporation doesn't get in trouble if their product is used in an illegal manner, the transporter/end user does.