Unless they are in a company that happens to have the magic number under 8% or are a Google or a Yahoo or a Microsoft or whatever... Then yes... You're most likely correct.
The only thing I can maybe see is if you have the presitgous positions at top law firms, banks, etc, you can negotiate for good insurance.
However, most employees will simply get dumped on the public plan because their companies will have to compete with other companies who do the same.
I keep going back to my example of two plumbing companies in the same neighborhood. As soon as one does it and is able to lower his prices and be more competitive than the other, the other company will follow and put its employees also on the public plan.
Lower costs of course is a good thing, however, I dont see how this does that. Maybe the business has lower costs, but the costs are going to get shifted to the taxpayers in the form of higher taxes.