I don't think this will lhave much impact on health care cost. The cost is high because it is paid through employer and therefore it is hidden from you. If the law was to force employers disclose lost wages for employees due to health car, that would have bigger impact. The real impact will come if employers turn off the medical insurence coverage entirely and everyone has to cut the checks themselves.
Employer-provided healthcare is a solution for the problem that health insurance, unless it is mandatory, will tend to attract a self-selected group of expensive customers and, in turn, make health insurance (even more) unattractive for healthy people.
