A new national survey of employers by Aon Hewitt indicates that the vast majority of businesses - 94 percent -- plan to continue offering health insurance coverage in the next three to five years. However, nearly two-thirds of companies plan to move away from a traditional "managed trend" approach to one that requires participants to take a more active role in their health-care planning. Aon Hewitt's survey included nearly 800 large and midsize U.S. employers covering more than 7 million employees.