Despite rising health care costs and other economic worries, a majority of large U.S. employers remain confident they will continue to offer health care benefits to workers 10 years from now. However, the level of confidence has slipped from last year due to economic concerns and uncertainty over the implications of potential health care reform, according to a new survey by Watson Wyatt, a global consulting firm, and the National Business Group on Health (NBGH), an association of more than 300 mostly large employers.