If others don't meet quotas, there's drops the next year.  When we purchase quotas that money is directly used to help those fisheries.  How is it dangerous?  We catch 3% of the annual poundage in the Pacific Ocean.  
Were importing fish because the demand is increasing. People that don't know the difference and dangers of consuming foreign product will buy based off price.  Some locals don't want to pay the going rate for fresh fish.  It's already hard and expensive to do business in Hawaii and the US and others outside of Hawaii are willing to pay.  If the market/consumers don't want or don't buy imported product wholesalers won't bring it in.  It's simple economics.  
Taking away fishing grounds by the federal government is exactly my point.  The demand is only going up and wholesalers will be forced to bring in even MORE imported product.  You just stated 5% of the total longline effort comes out of the expanded area, you now have 5% more imported product possibly contaminated.